Help with this hand.

A question, what should I’ve done before the flop, after the flop, and anything else I did ?
My opponent: JD, 10C
Me: Ah, 7h
He limps. I raise just enough to get chips and keep him in the hand.
Flop: JH, 3H, JS
He checks. The way he said check, made me believe he had a pair or a set of J’s. Either way, I can win if I hit my flush. I think I should try stealing the pot because I’m on a semi bluff, I bet twice the pot. He check raises by going all in. I’m on a semi bluff so I call. After the turn and river I bust out to a set of J’s. Didn’t get the flush.
What should I’ve done before and after the flop?
Thank you for your help, Tony.

If you believed you he had the set when he checked the flop, then you should have believed that a semi-bluff is a bad idea.

The point of a semibluff is to add the 30 odd percent chance you have of making a flush if he calls, to the 20-40 percent chance that he will fold to your bet. If the percentages add to more than fifty then it's a profitable play in the long run.

The right move, assuming again that you suspected him of having the J, was to take your free card.

the point of semibluffing is to induce a fold. if you think he had trips then he obviously isnt going to fold, so you should have taken the free card. draw cheap.