1) Put $100 in your account for $2nl and $1 tournaments.
2) Focus on your game, pay attention to villains, try to understand their strategy, determine and implement a plan to exploit that strategy.
When you play a hand where you felt lost, or weren't really sure what to do, post it and discuss your thoughts behind your plays.
3) Looseness & aggressiveness are independent of one another. You can be loose or tight, passive or aggressive. Starting out be tight, very positionally aware, and aggressive. At uNL players can win playing just about any style, but learning to play a solid TAG game will lay the proper foundation to build your game upon in the future.