I started grinding with a $5 bankroll in late Oct 08. It is now up to $100, so I may be of some help. I assume you will be playing 2NL.

1. With a $15 roll, you have 10 buy ins at $1.50. That's a good starting point.

2. Table selection is crucial. Pick the tables with low average pot size. 30 cents or less. You will get more playing time out of your small roll. Something to note is the size of the average pre-flop raise. If it is more than 5xBB, change tables. This really matters when you are under rolled. Trust me.

3. Avoid coinflips for stacks. All you would be doing is testing your luck. AK is not that strong of a hand. Play it strong of course, but try to see flops with it. Don't be overly aggressive. Push all in only if your opponent is very likely to fold, and not because you wanna race.

4. Be patient. Unless you get lucky often, this will be a long slow grind. Pay attention to bankroll management. I just moved up to 5NL when my roll hit $100. I took shots before I was properly rolled and it set me back.

I'm far from an expert, btw. But I am currently doing what you are just starting to do. Hope this helps. Good luck!