I am unsure of these kind of hands, when they bet into me and I think that I have the best hand.

Now I made him fold, but the reason I reraised him was the possible straight draw on the board.

Should I have done it differently (to earn more money)? And what should I have done if there had not been a draw on the flop?

PokerStars No-Limit Hold'em, $0.02 BB (7 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 ($1.24)
Hero ($4.94)
CO ($3.27)
Button ($0.76)
SB ($5.59)
BB ($2.94)
UTG ($3.07)

Preflop: Hero is MP2 with 3, 3.
1 fold, MP1 calls $0.02, Hero raises to $0.1, 2 folds, SB calls $0.09, 1 fold, MP1 folds.

Flop: ($0.24) 8, 7, 3 (2 players)
SB bets $0.08, Hero raises to $0.24, SB folds.

Final Pot: $0.40