1. yes, so before Oct 1, you need to work based on the OPT EAD.
2. Really no difference to you, because your H1 won;t start before Oct, so either H1 transfer or a new H1 won't start before Oct 1.
2. Really no difference to you, because your H1 won;t start before Oct, so either H1 transfer or a new H1 won't start before Oct 1.