What’s the best method of finding long term accommodations is there any good groups for it?

Hi after some advice re registering address and 90 day reporting. For the last year and a half I have been living in Udon Thani with a woman, staying at her house. I registered with immigration when I first moved there. Also I have a yellow book for the address. We have now gone our separate ways and I have moved to a different province. At the moment I am staying in hotels so I assume no problem with TM30 registration as this will be done by the hotel. In the next week or so my plan would be to find some long term accommodation. What I would like to know how it works. Somehow I will have to register at this new address. I also have a 90 day report due in the next 3-4 weeks. And finally what happens about the yellow book. I would be really grateful for any info or guidance on how to sort things out. If it makes any difference I am here on a yearly extension of a non o visa for retirement.