Researching information about penny stocks can be different from the research for other types of common stocks. Penny stocks are usually traded at the over the counter exchanges, and they are listed on the Over the Counter Bulletin Board and Pink Sheets. There isn't very much free information that is readily available about penny stocks, particularly because only very few shareholders own them.
Therefore, if you are serious about getting into penny stocks then you should consider subscribing to some paid penny stock research service. These can help you learn more about the companies that you will be investing in. You should find out about the products and services that the company offers as well as the management that is leading the company.