Before you obtain a Thai licence, foreigners are required to have both licences to legally drive in Thailand.
Having both also makes it much easier to obtain a Thai licence. It's a small cost to make life easier...have an accident, no intetnational licence, no insurance
Get an international drivers licence prior to leaving, and don't forget your US licence. Open a Thai bank account to transfer your funds to and use the Thai ATM card here. With the right visa seek out a yellow card, and get a pink Thai identity card, along with a Thai drivers licence.
Some of these will take some time after arriving, but worthwhile when you stay long term.
It's a good idea to have a base..saves lugging your gear every day. go explore, just rent on a weekly basis, so if you find somewhere you like, it's easy to relocate, no long commitment..