UK marriage needs a stamp and translation. We did it using an agent in London. Mrs flew to Thailand to get new ID card and Koror 3. We are still in the UK but good to go when we do what you are doing in a year or so time.
Mine had 4 visit visas. Follow the instructions, provide the evidence. Write a good sponsor letter along with a proposed visits of landmarks/places you plan to show here. Confirm she will return home and not be to any cost to the UK system.