[dln]

You should have raised pre-flop with the jacks if for no other reason than to get the blinds out, since you have a high pair few opponents is ideal. with this play you also would have had more information when re-raised. Although your concern about the callers in such a low limit game is warranted, they would more than likely check to you on the flop, unless they hit one of their overcards, then you make the decision to play or fold.

you never want to "semibluff" raise in early position, because besides losing "customers" behind you who don't want to cold call it, what do you do if they do call and your card doesn't come? you'd be forced to check to them. You can get a free card in late position in addition to increasing your pot odds