You find a Thai partner you buy in their name and be prepared to write it off if it all goes tits up. It’s that simple really. Stay clear of condos, they will tell you anything to sign you up. Beware of the leases on these condos. It ain’t like the uk. If you don’t want to chance it with a Thai partner. Easy just rent, rents are much cheaper here than uk.
If you want it to run smooth get an agent to do for you. Did this in the summer. 6 months visa. It’s not easy if you have never done before. Now living in udon. Biggest things are proof of support, length of relationship, proof that she has good reason to return to Thailand.