put $50 into a site with 1c/2c NL and work your way up ..

That way, you first learn ABC poker (as mentioned above, DONT BLUFF.. bet good hands, and play very few hands) ... Then as you build your bankroll you can move up in stakes....

This way your just risking $50

Thats how I started (well close to it, I played at a site with 5c/10c NL, and after spending a total of about $60 I started making money and worked my way up to where I am now)

Edit: A couple other things, use a spreadsheet (or at LEAST a notebook) to keep track of your play... Write down every deposit and every withdraw. Write down how much you sit down at every table, and how much you stand up with... This way you know exactly how good or bad your doing.