Should I have just checked the flop with an overcard and 4 people in the hand? How was my overall play on this hand, is JJ good enough to open UTG 6-handed?

Party Poker No-Limit Hold'em, $0.25 BB (6 handed) Hand History converter Courtesy of Poker coaching - Get an online poker lesson - texas holdem strategy for real poker

saw flop|saw showdown

BB ($16.51)
Hero ($25.65)
MP ($40.26)
CO ($17.07)
Button ($88.77)
SB ($25.77)

Preflop: Hero is UTG with , .
Hero raises to $1, MP calls $1, CO calls $1, 2 folds, BB calls $0.75.

Flop: ($4.10) , , (4 players)
BB checks, Hero bets $3, MP calls $3, CO folds, BB calls $3.

Turn: ($13.10) (3 players)
BB checks, Hero checks, MP checks.

River: ($13.10) (3 players)
BB bets $3.75, Hero folds, MP calls $3.75.

Final Pot: $20.60

Results in white below:
BB has As Ts (flush, ace high).
MP has 8d 8h (three of a kind, eights).
Outcome: BB wins $20.60.

your play here is pretty much fine, though i'd also consider checking the flop. as to your pf question......dear god yes. at a six max table i open all pocket pairs UTG, even 22

I raise from any position pf on a six max with JJ. Checking flop may have been better since there's so many in the hand, but the turn was standard and the river was obv