This might seem stupid to regulars here, but I've only just moved up to 20NL, and I've found that my game is far from rounded - I'm used to c-betting, betting my good hands and folding my bad hands in 10NL to get a nice winrate, but there's quite a few more TAGs up here, and I feel that I need to put a bit more thought in my game. I feel that I've got quite a few gaps in my game/knowledge, and posting here for advice will help me plug those gaps.

Hand 1:

iPoker 20NL FR, 10 players. Just joined, one orbit, no reads. I'd made a standard 4x preflop raise and taken it down with a c-bet postflop.

Seat 3: vizz ( $17.10 )
Seat 7: Resistance ( $12.45 )
brentmcc1965 posts Small Blind $0.10
mcscoots posts Big Blind $0.20
xMonster77x posts Big Blind $0.20
Dealing cards
Your cards :Td: :Th: [Resistance]
2 folds
vizz calls $0.20
1 fold
xMonster77x checks
punischer calls $0.20
Resistance raises $0.80
3 folds
vizz calls $0.60
1 fold
punischer calls $0.60
Dealing Flop
vizz checks
punischer checks
Resistance bets $2.50
vizz raises $5
punischer folds
Resistance folds
Winner is vizz $10.05

Was vizz kind enough to let me know he had a set there, or could he have been betting a big draw like 5h6h? How often is this a big draw or something stupid like A9 for me to want to get all my chips in with a weak overpair? Good/bad fold?

Hand 2:
20NL FR full table.

I'd been playing standard TAG for a couple of orbits, hadn't seen any crazy shit, just seemed like a standard semi-loose table.
Seat 1: Resistance ( $11.75 )
Seat 2: paolofutre23 ( $7.20 )
Seat 3: GrodanBolll ( $15.95 )
Seat 6: JLYN ( $8.65 )
Seat 9: NeoDk ( $4.80 )
paolofutre23 posts Small Blind $0.10
GrodanBolll posts Big Blind $0.20
Dealing cards
Your cards :Ac: [Resistance]
2 folds
JLYN calls $0.20
1 fold
NeoDk calls $0.20
Resistance calls $0.20
paolofutre23 calls $0.10
GrodanBolll checks
Dealing Flop :Ad: :As:
paolofutre23 checks
GrodanBolll checks
JLYN checks
NeoDk checks
Resistance bets $0.80
Everyone folds.
Winner is Resistance $1.75

Firstly, is flat limping on the button in a family pot with Ac9c ok? Should I be raising here?

Secondly, the flop.. I felt that despite me hitting trips, it was a fairly weak trips, what with my poor kicker. I also felt that the only money I'm getting there is through a 9, and that betting the flop would be more likely to lure a 9 in than checking and having to bet the turn hard in order to make up for the lack of money going in on the flop. Should I have checked along with the rest and hoped that someone would hit a picture on the turn?

Cheers, I might add any other hands I come across sometime as well.