baggyjeans:
First of all, congratulations on your upcoming marriage!
Re. your question, in my view, the important thing is to be sure about a personal faith in the Savior, the Lord Jesus Christ, the only Savior of sinners. One of the Bible's most famous verses is: 'For God so loved the world, that He gave His only begotten Son, that whosoever believeth in Him, should not perish, but have everlasting life' (John 3.16). Making sure that you and your fiancé are in the good of such a faith would be an excellent basis for your married life together.
I'll stick my neck out and say that one's relationship with a local church is pretty meaningless unless the person first of all has that personal, vital faith in the Lord Jesus. I don't know you, and it may be that you are already a regular Bible reader, and so I can encourage you to make a habit of a prayerful, dependent Bible reading day by day. (Maybe read John's Gospel, where the text, above, is taken from.)
God bless His Word to you.