Ok so im on the button with TT, with one limper before me I limp as well. Small blind folds and Big blind checks. Flop comes As 8s 8d. Both players check and I bet half the pot. Figuring if one of them had a spade they would bet due to the board having two spades. Was this semi-bluff wrong?

Now the player in the blind went all in and I quickly folded. but lets suppose he just called. What do I do next if a card besides a spade falls? Do I check it out now believing he has a ace or eight. Or if it is a no help card say a 2h. And he checks do I bet at him again?