99 in BB against a loose limper + CO's raise

[Mitke]

Poker Stars, Limit Holdem Ring game, Limit: $2/$4, 9 players

MP1 - a fish: 69 hands / saw flop 54% / Flop-Turn 68% / preflop-raise 18.8% / aggF 0.7
CO - TAGgy: 136 / 17.6% / 70.8% / 10.3% / 4.0

Pre-flop: (9 players) HERO is BB with 9[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img]
2 folds, MP1 calls (1.5:1), 2 folds, <font color="red">CO raises</font>, 2 folds, <font color="blue">HERO ??</font>

MP1 is a fish and has pretty wide range of hands we are ahead of preflop. CO is a TAG and has been in the table long enough to notice that MP1 is a fish. What's our our plan?

Continued...

HERO calls (4.5:1), MP1 calls (5.5:1).

My reasoning for the preflop call was that I'm not gonna get MP1 to fold anything and hope for low flop to get aggressive with CO.

Flop: 9[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/heart.gif[/img] (6.5SB, 3 players)
<font color="blue">HERO ??</font>

We hit a set and probably have a big equity edge in a smallish pot. The fish with all of his dead money sits between me and the TAG preflop aggressor. The board is somewhat drawy. What's our plan?