Easiest way is to get a really good lawyer that specializes in family laws. Expect to pay around RM9-10k all in for a joint petition or double that for a single petition for a good lawyer. Just don’t ask me how I know so much.
Prenup doesn’t hold any water in court as it is not legally recognized and it’s at the presiding judge’s discretion on whether if your prenup is valid or not. Don’t bother with it.