The general rule on preflop raises is that you raise 3bb+1bb per limper to 5+1bb per limper. At lower limits I think 4 or 5+ is better, so .08-.12 works.

I don't mind a suited ace to raise a weak limper. You might be dominated, but chances are that a cbet takes the pot down most of the time. It's a trial and error kind of thing. Some opponents allow you to do this, some don't.

After the check there's no way I check behind. The only way we can iso with Axs is if we plan to cbet flops like this. Add a gut shot and checking here is a sin. I'd be .12, but it's hard to give you an exact most-profitable bet. A good rule is to be whatever you'd bet with an over-pair.

You hit the gin card on the turn, just get it in however you can. If he beats you here consider it a cooler and move on to the next hand.