Which Site?

[excession]

For a wide range of low stake Ring games and SnG's I would recommend Stars, UB or the Prima network.

I would absolutely get PokerTracker + PAHUD asap as well.

Contrary to what some of the posters seem to be saying you don't necessarily have to play at the site with the best maximum income potential when you are learning - so long as your bankroll is growing it is more important to play some poker against players that let you see some flops and don;t bet every 2nd pair like it's a set - sure bear-hunts can be fun are are very lucrative but hardly require that much in the way of poker skills esp. at low-limits. You should play different styles and at different flavors of table to see how the game works.

UB and Stars have some of the stronger low stake players on the Net, but they are still good places to start.