11 Redouble. This bid does not necessarily promise trump support, but it does request the opening bidder to pass at his next opportunity. Now, as the defender is forced to extricate himself from the redouble, you will be in a position to inflict punishment.
If partner is permitted to play one spade redoubled, your high-card strength should carry him through, even against a bad trump break.
12 One no trump. You lack the strength for a redouble, yet if you pass it may prove too difficult to enter the auction later. The best strategy is to advise partner of your moderate values by bidding one no trump. This will place him in position to contest further, should that appear to be expedient.