TD Ameritrade is what I use they have a no limit requirement and trades are only 9.99. However, unless you're planning to invest in penny stocks you're going to need more capital to see any real benefit.
You can get account on freelancing websites and can get work from there by bidding on different works
Check these sites
www.odesk.com
www.elance.com
www.freelancer.com
www.rentacoder.com
I'm willing to invest 2 or 3 hundred dollars. Please have experience, or source separate from something you googled.