Help with this hand please.

[deaders]

Prima NL$10 10 Handed

No real reads only sat down for about one orbit. So far very passive preflop, lots of limping.

Hero is dealt A[img]/images/graemlins/spade.gif[/img] 10[img]/images/graemlins/diamond.gif[/img] in CO.

Preflop: 2 Folds, Call, Fold, Hero calls, Button folds, SB completes, BB checks.

Thoughts: Limp A10o here? Probably should have raised?

Flop: 10[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img]

Checked to hero who bets the pot, 0.40. BB calls, others fold.

Turn: A[img]/images/graemlins/club.gif[/img]

BB checks, Hero bets 1.00, BB raises 1.00, Hero raises 5.00, BB calls all in for 3.50.

thoughts: seems horrible afterwards, thinking at the time the BB could have hit a lower 2 pair with the ace on the turn. BB only had 3.50 left after the raise so i figured put it all in with top 2 pair.

River: 8[img]/images/graemlins/diamond.gif[/img]

So thoughts please... tell me where I went wrong. Pretty inexperienced at NL and need some constructive criticism.