400 NL, AA with somewhat shitty flop

I'd really appreciate getting some opinions on this hand, thanx in advance. Hero was new to the table, so assume no reads. Sorry for the bad formatting, but this is actually not one of my hands, so I don't have the HH in my PT.

NL 400$ buy-in
Seat 1: UTG+1 ( $836.33)
Seat 2: Hero ( $354.76)
Seat 3: Button ( $281.20)
Seat 4: SB ( $533.44)
Seat 5: BB ( $292.25)
Seat 6: UTG ( $179.80)

SB posts small blind (2)BB posts big blind (4)**
Dealing down cards **
Dealt to Hero [ Ah, Ac ]

UTG folds. UTG+1 folds. Hero calls (4)
Button raises (14) to 18. SB calls (16)
BB folds. Hero raises (94.60) to 98.60.
Button folds. SB calls (80.60)

** Dealing Flop ** : [ Kd, Ks, 7c ]
SB checks. Hero checks.**

Dealing Turn ** : [ 4c ] SB bets (125)


What is your opinion on heros preflop action? What, if any, mistakes did hero make? What is heros next action?

hero sucks for limping AA.
Ok, harsh but beyond that what sort of range do you put sb on?
Site might help. He called the limp reraise and called a raise oop originally which makes any kx unlikely (maybe KK but meh) I just cant see him having hit this flop, so his hand must have been made preflop so id limit him to AA/KK/QQ/JJ/TT probably but mostly the top 3 of those.
other than that you have what 250left behind and are facing a 200odd pot. I guess im pushing and if he hit that board then meh his play carnt be +ev preflop
i dont think you have enough left behind to c-bet and fold with the preflop action but thats my opinion certainly.