Villain is basically unknown besides that im pretty sure he's a reg. What do i do?

PokerStars No-Limit Hold'em, $6.00 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Hero (SB) ($612)
BB ($621.60)
UTG ($683.05)
MP ($726.75)
CO ($709.40)
Button ($770.40)

Preflop: Hero is SB with 9, Q
4 folds, Hero bets $18, BB calls $12

Flop: ($36) 6, 6, 5 (2 players)
Hero bets $30, BB raises to $96, [color=#CC3333]Hero