I'm sure any Real Estate agent would show you around condos in various areas, but if you don't know Pattaya it would far better to get a hotel for a couple of weeks, then view a few rental properties, rent for several months and then take your time to get to know the different areas of Pattaya, then make an informed decision on where to live.
Your Landlord, unless he's been living in a cave for the last 10 years he was definitely aware of Tm30 registration, just couldn't be bothered or didnt do it for other reasons such as highlighting his own visa or tax status.
Immigration are are already cracking down on 60 day border bouncers. Either get a retirement extension yourself or pay an agent, with money in the bank should be less than 10k. PM me for good agent if you want.
Keep UK bank account open, don't bring all your money over in one go, consider keeping at least some investments in the UK, buying properties for rent in a market you are unfamiliar could be an expensive mistake.
New ETA Electronic Travel Authorisation is being introduced in early 2025, fully by June 25, but delays have already occurred, dates are bound to change.