Is there anything wrong here with my preflop and flop play? i just want to know whether i should attack a bunch of limpers in position preflop and my flop raising size is good or not?

PokerStars No-Limit Hold'em, $1.00 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($84.55)
UTG ($51.20)
UTG+1 ($104.90)
MP1 ($103.50)
MP2 ($24.90)
MP3 ($127.05)
Hero ($100.45)
Button ($189.35)
SB ($162.10)

Preflop: Hero is CO with 6, 7.
1 fold, UTG+1 calls $1, MP1 calls $1, MP2 calls $1, MP3 calls $1, Hero calls $1, Button calls $1, SB completes, BB checks.

Flop: ($8) 5, 9, 3 (8 players)
SB checks, BB checks, UTG+1 checks, MP1 checks, MP2 bets $14, MP3 folds, Hero raises to $28, Button folds, SB folds, BB folds, UTG+1 raises to $103.9, MP1 folds, MP2 calls $9.90 (All-In), Hero calls $71.45 (All-In).