AT facing a raise on flop

[Clownfish]

Both players have been at table less than 40 hands. Here is what we know so far...

BB is 50/6/.95
MP1 is 22/4/3.6

Poker Stars
Limit Holdem Ring game
Limit: $1/$2
9 players
Converter

Pre-flop: (9 players) Hero is MP3 with T[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img]
2 folds, MP1 calls, MP2 folds, Hero calls, 2 folds, SB calls, BB checks.

Flop: K[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/spade.gif[/img] (4SB, 4 players)
SB checks, <font color="#cc0000">BB bets</font>, <font color="#cc0000">MP1 raises</font>, Hero folds, SB folds, BB calls.

Raise preflop?
3 bet or fold this flop?