When moving to Thailand, especially if it is your first visit, you will need a hotel for the first few nights, until you find a house or appartment for a long term rent.
I added here a few listings with hotels in Thailand you can book, for the most requested destinations in Thailand. In most cases, you need to pay only once for the room, no matter if you stay with one or two people. Other destinations in Thailand, which are not listed here, can be reached over the menu on each site.