I'm getting back into poker after a decade long break and plan on working really hard at improving my game. I just purchased From the Ground up and will be putting in some decent volume and posting lots of hands. I'm getting lost in some pretty routine spots. Please critique my play and thought process. I think its possible that I misplayed every street.

No reads on villain but he's also on my other two tables so I will assume at least somewhat competent.

GG Poker - $0.10 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

CO: 64.3 BB
BTN: 122.3 BB
Hero (SB): 102.2 BB
BB: 79.5 BB
UTG: 102.7 BB
MP: 164.6 BB

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Ad 9d
fold, fold, CO raises to 3 BB, fold, Hero raises to 10 BB, fold, CO calls 7 BB

Flop : (21 BB, 2 players) 2d 4s 2h
Hero bets 7 BB, CO calls 7 BB

Turn : (35 BB, 2 players) 8c
Hero checks, CO bets 17.5 BB, fold

CO wins 32.3 BB

Preflop: I think I'm ahead of villains range and also have a reasonable chance to take the pot town pre. I will obv fold to a 4 bet.

Flop: No reads but villains range could look something like like 22-TT, A2s+, ATo+, KJo+,QJ+ and suited connectors. This board is unlikely to have improved villains hand and I am likely still ahead.

Turn: I have no idea wtf I should be doing. His hand looks like it should be more 22-TT, or maybe A highs. He should also be floating pretty wide on the flop though right? I don't know so I check fold.