You will not beat 2nl by opening suited connectors, gappers, belly busters, etc. You will rarely flop well enough to show a big profit because 2nl villains don't have a fold button. Raise your big hands, isolate with broadways, set hunt, value bet, profit. Don't steal with 97o from the CO because you suck postflop and villains don't fold. Play 12/10 nit-tag ABC poker and you will beat the game for 5ptbb/100 over a decent sample. Learn to walk before you run.