@Onestop *****

try here, they are very good and very helpful

A TM30 is a notification if the hotel/condo owner to immigration that you are staying at that address. So every time you change address the condo/hotel owner should notify immigration

A TM47 is a 90 day report which you have to do every 90 days, unless you leave the country and come back in. The 90 days is from when you enter back into Thailand, surmising you had a exit/re-entry stamp in your passport before you exited Thailand!