Wash your hair before you perm, but don't use conditioner. Damp hair is easier to wrap around perm rollers, and it's going to be a while before you can re-wash your hair after the perm!
After the...
You can do it the same day. But you do it after the perm and don't do a permanant! Only a semi or the permanant will ruin the semi, or if you colour before, the perm will strip the colour,.so ask ur...