Re: transom repair or replace
Welcome to the Dry Dock,
I'd suggest some serious reading first, there are tons of transom replacement threads here. Just do a search for transom repair. After hours of reading, then post back some more specific questions.
Not trying to give you a short answer here, just that most all you need to know is alread here.
We're here to help with anything that comes up and there is nothing you'll run into that's hasn't been handled here before.
Good luck.
CW