If you have decided to go ahead and buy and sell your own stocks, but  where do you begin? Thanks to in Internet you can find out a lot by  just logging on. 
It is suggested by many financial experts that  before you lay down any hard-earned money, you need to first research a  few stocks to see if they are sound companies that have the potential to  earn money and grow over time. 
One of the best sources of  information about a public company is in its financial reports, like an  annual report, a quarterly report, or a special filing with the  Securities and Exchange Commission. And luckily for everyone, these  reports are usually available online at each company's web site, or at  the SEC’s EDGAR database online (which is also free). 
Perusing  the annual report or looking at a company’s earnings report can tell  you a lot about how the company is doing and, in some cases, what they  have in the pipeline that will help it in the future. 
And there  is some quick math you can do to test a company’s health. You may have  heard of “earnings per share” or “profit margins” or “price-to-earnings  ratios”--and you should familiarize yourself with a few of these terms. Visit the glossary to find out more about those terms. 
Another  good source to find out more about a company are Wall Street analysts  and stock brokers. Analysts and brokers are usually employed by a bank  to give their opinions on a stock. Some say you should buy, or hold,  accumulate a particular stock, but if you look beyond the opinion there  is sometimes hard numbers and much research to read up on. 
A good  strategy is to use analysts and brokers to get information about a  stock and then to check some of the numbers for yourself before  investing. 
Keep abreast of what analysts are saying and how it  affects a stock. Some analysts carry a lot of weight and what they say  can move a stock significantly, within minutes of giving an opinion. And  others are just dead wrong about a stock again and again. 
Also,  if you are investing for the first time, look for a company that has  been out for a while and is paying dividends and has a low  price-to-earnings ratio. Older, more solid companies tend to have some  history of excellent earnings and you can learn a lot by studying a  company that has a good track record. 
And although history  shouldn’t be heavily-weighed when making a stock pick, looking at what a  company has done in the past can help you see how it might react to  changes in the future.
Risks
You  will also want to learn what risks are involved when investing in  stocks especially if you plan on buying and selling them often. Although  some people trade stocks for a living, it is not for everyone and can  really be a dangerous endeavor that will eat up your savings in a jiffy.  And there are arguments as to who makes more money over time--the  active trader or the buy-and-hold types. 
Make realistic goals  about how much you may make on a stock over time. Some think that since  they have been making 20 percent gains or more in the past couple of  years, that this will always be the case. That is not very realistic if  the market slows down and it is more difficult for companies to make  profits. Do not take on more risk than you are comfortable with just to  hope for above-average returns. 
Diversifying your stock  portfolio, or investing in different stocks with different revenue  streams is really key. Make sure you spend a lot of time looking at the  forest as well as the trees. And stock splits and other factors can  really effect how your stock portfolio is weighed so set aside time to  revisit your goals. 
And remember that everyone is in it for the  money--not just you. Brokers, exchanges, fund mangers, etc. Use your  broker or fund manager to find out exactly what you are getting into.  Really find out how a broker or fund manager makes money off of you and  what fees are involved. Go to the various stock exchange web sites or  SEC's web site and read up on regulations and risks. 
This is  especially true when it comes to margin accounts--or an account that is  set up by a broker who lets you borrow money, pay interest on that  money, and trade it as well. Margin accounts can be very risky, so know  the risks before signing up. 
The key to successful stock picking  is that you must do your homework and find out as much as you can about  the company behind the stock. Really dig and don't give up. There's tons  of free information out there and the more you know the more you will  be rewarded. 
It's a big job, which is why many rely of mutual  fund managers, brokers and others to do the stock picking for them. But  if you have the knack, the time and the money, nothing is standing in  your way to do it yourself.
 Corporate filings with the SEC
One of the best ways to begin researching a company’s financial  health and history is through corporate filings with the Securities and  Exchange Commission.
Reports filed most frequently by companies  with the SEC include, annual and quarterly reports, insider transaction  documents, IPO- related documents and other registration statements. 
The  following provides a brief description of the most frequently filed  documents with the SEC (for a full description visit the agency’s  description of SEC forms  ): 
Typical  information provided in an annual or quarterly report includes,  financial data, results from continuing operations, market segment  information, new product plans, subsidiary activities and research and  development activities on future programs. 
Insider transactions  are among the most common corporate filings with the SEC. Every director  officer or owner of more than a 10 percent stake in a company must  disclose their holdings with the SEC. These filings are made on Forms 3,  4 and 5.
Registration statements filed most often by companies  include S-1 and S-3 documents. An S-1 is a basic registration form filed  when a company’s planning an IPO. After a company has been publicly  traded for a year, any subsequent plan to offer securities, which may  include common stock, preferred shares or debt securities, must be filed  through an S-3 registration statement. 
Visit MarketWatch.com’s column, which provides daily coverage of the latest in SEC Filings. Also, visit the SEC’s free online database of filings, EDGAR.