Poker tracker is extremely useful for monitoring your success.

If I were you, I would play at 10nl until you get to around 500, and then you should move up to 25nl ASAP. Truthfully, I found 25 to be much easier.

Then quad or tri-table the 25nl to infinity and beyond. I wouldn't even stop at 1000 or 1500. You can't be sure that you are ready to move up until you are sure that you are successful at your current level. (successful at 25nl = greater than 15bb/100 over at least 10000-15000 hands)

By that time you will be more than rolled for 50nl and can play with confidence and a lack of attachment to fifty dollars (cuz' your roll will be like 2k).

Good luck.