Villain just sat down. How much to c-bet, and what do I do if he reraises?

PokerStars No-Limit Hold'em, $0.05 BB (5 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

UTG ($10.73)
MP ($0.95)
Button ($6.26)
SB ($5.25)
Hero ($10.21)

Preflop: Hero is BB with , .
1 fold, MP calls $0.05, Button calls $0.05, SB completes, Hero raises to $0.25, MP folds, Button folds, SB calls $0.20.

Flop: ($0.60) , , (2 players)

SB checks, Hero?