What do you usually do when your TPTK flop bet gets raised on a dry board by an unkown? I have no read, and was new to the table. Please comment on my line vs alternatives like what I wrote in parentheses.

The hardest decision was calling the flop raise since he played the rest passively. With his flop raise I amWA/WB since it could be a lower pair or air testing if I'm c-betting, or it could be a set, OESD, or oddly played AA/KK.

Party Poker No-Limit Hold'em, $ BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($53.05)
Button ($73.61)
SB ($52.75)
BB ($53.80)
Hero ($50)
UTG+1 ($131.94)
UTG+2 ($38.45)
MP1 ($57.22)
MP2 ($49.25)
MP3 ($39.50)

Preflop: Hero is UTG with Q, A. SB posts a blind of $0.25.
Hero raises to $2, 2 folds, MP1 calls $2, 1 fold, MP3 calls $2, 4 folds.

Flop: ($6.75) 6, Q, 7 (3 players)
Hero bets $4, MP1 raises to $11, MP3 folds, Hero calls $7. (fold? seems uber weak but I could find easier pots to win.)

Turn: ($28.75) 5 (2 players)
Hero bets $12, MP1 calls $12. (check/call? bet more? I figured I was value betting a lower pair and would fold to a push symbolizing a likely set or str8)

River: ($52.75) K (2 players)
Hero checks, MP1 checks. (block/value bet?)

Final Pot: $52.75