How to play medium Top Pair

[Steve Chase]

NL Holdem ring games. Assuming No Read. Everyone is a fine player.

Let's say I am at BB with T5 and the flop is T72 Rainbow (no preflop raises). 4-5 people in the pot. I am the first to act.
Should I bet or check?
If I bet, how much should I bet (1/2, 1 x pot?).
If my bet get reraised, should I call or fold?
If I check, someone else bet with the pot, should I fold, call or reraise?

Thanks