Look everywhere possible for ammo. If theres a draw, cupboard etc theres a chance theres something useful inside. 3 shots sounds about right. You can get away with 2 sometimes if you manage to floor them with 1 then shoot their head when they are down. If you run out of bullits you can resort to the knife. Eventually the bell goes and they all go to the church, leaving you to have a good look around. Also I went left at the track and not straight in to it all.