There's no difference between on-line trading and regular trading. Unless you understand some of the basics, going to on-line trading sites is an absolute waste of time
Start your investing/trading education by learning why you should invest, and the importance of being able to make your own decisions. See how the pros have done it. Start by reading, What Works on Wall Street by James O'Shaunessey, Beating the Street and One Up on Wall Street both by Peter Lynch, The Warren Buffett Way by Robert Hagstrom, Trading For A Living by Alexander Elder; “Mastering the Trade” by John Caster; “How to Make Money in Stocks” by William O’Neil; and The Disciplined Trader by Mark Douglas
Get into the habit of making daily visits to some websites like MSN Money and Yahoo Finance. While at MSN read the Commentaries by Jim Jubak, Jon Markman, Harry Domash, and Liz Pullman Weston. Following the strategy lab analysts to get a feel for what the pro’s are doing and why. This site has some basic information for beginners. If any site offers free information, take it.
Other website that can provide instructions and help with procedures and terminology are Investopedia.com, Stock Charts.com, and 1source4stocks.com
Visit some of the more professional websites like Zacks.com, Smart Money, Schaeffers.com, Trading Trend, Trading Markets, these website will have advertisers who are worth looking into also. And remember, if they offer free information, get it.
Attend all the free seminars you can, just be careful and don’t get pressured into anything you really don’t want or need. Most schools offer courses in finance and economics, but very few will have courses on the mechanics of the investment markets, if they do try taking the course. You may want to consider on-line courses, the New York Institute of Finance use to have such courses. Try to get some fee information from the stocks exchanges they all have (had) free booklets, SIAC and some of the regulators (FINRA SEC MSRB CBOE) may provide some free literature.
What do you need to go into the market?
1 - A written sound trading/investment plan with rules that will not only help you but more importantly protect you, mostly from yourself.
2 - Sufficient trading/investment capital. Use your own money, there’s no need to go into debt so that you trade/invest.
3 - A written money management program in place. Remember never invest 100% of your capital into any one security and never have 100% of your capital invested.
4 – A full and complete understanding of the rules & regulations of the industry.
After you learn the basics, then you can go into the markets,
but to do it the other way you're going to endup with a very costly education.