You dont need to apply for a tourist visa most passports are visa exempt for 60 days. If you have a hotel booked make sure you get the address for the TDAC you have to fill out
tdac.immigration.go.th/arrival-card/#/home
This has to be done within three days of arrival if you do not they will have you do it before you are allowed to enter saves time.
When you get to the hotel if you are planning to stay longer then 60 days or upgrade your visa to something else ask the hotel to provide a tm30 some will some wont.
Tm30 are for people here longer then 90 period of you intend to stay past that for any reason with approved visa
You dont need a tm30 for going to a hotel for one night I was in CM for 3 nights ( not my address on tm30 ) to visit and returned to my registered address. If you want recommendation for hotel check into star hotel. Personally suggest that hotel its location to everything in CM and fair priced.
For visa exempt you just show up with passport and filled out the TDAC and you get 60 days. Tourist visa you can extend 30 days with a fee at immigration