My first play along - 44 flops a draw

[Christian_Peters]

I decided to make this a play along because there are about 3 spots in this hand where I am not certain of the right move. I hope it isn't painfully obvious or anything. Since I'm not sure how the response will go, I'll just post each part in about 5 or 10 minute intervals. There should be only 3 parts.
-thanks
Christian

My very first hand at the table. No reads.

PokerStars 0.25/0.50 Hold'em (9 handed) Hand History Converter Toolfrom

Preflop: Hero is BB with 4, 4. MP3 posts a blind of $0.02.
UTG calls, UTG+1 calls, MP1 calls, <font color="red">MP2 raises</font>, MP3 (poster) calls, 2 folds</font>, SB calls, Hero calls, UTG calls, UTG+1 calls, MP1 calls.

Flop: (14 SB) 5, 6, 3 (7 players)</font>
SB checks, Hero checks (Betting here is very bad - agree?), UTG checks, UTG+1 checks, <font color="red">MP1 bets</font>, <font color="red">MP2 raises</font>, MP3 calls, SB folds, Hero calls (pot is just too big to let this go, right?), UTG folds, UTG+1 calls, <font color="red">MP1 3-bets</font>, <font color="red">MP2 caps</font>, MP3 calls, Hero?????? </font>