Villains are unknown. How do I approach this hand when OOP? Lead, checkcall or checkraise flop. And what is my plan for the turn and river?

Party Poker No-Limit Hold'em, $ Hero (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP ($78.80)
Button ($111.60)
SB ($34.46)
Hero ($109.20)
UTG ($81.70)

Preflop: Hero is BB with J, J. SB posts a blind of $0.50.
1 fold, MP raises to $3, Button raises to $5, 1 fold, Hero calls $4, MP calls $2.

Flop: ($15.50) 5, 4, 4 (3 players)
Hero is very confused...