I have a 90 day O retirement visa. I need to convert to one year. What forms and documents do I need to bring to immigration?

I entered Thailand on a 45 exempt visa on 6 December. I come from UK and had applied for a 90 day O retirement visa but it didn't arrive in time for me to use to enter Thailand. I now have that visa and I can activate it anytime up until the beginning of March. Do I need to leave Thailand and reenter to be able to activate this 90 day visa? Because I hate coach travel if I need to leave and reenter I was planning to fly to Vientiane, stay overnight and fly back to BKK. Is this long enough away? Separate question. I am renting a condo in Pattaya but no TM 30 has been filed. If I wanted to extend my 45-day exempt visa in the Pattaya immigration office would I be asked for a TM30? Many thanks for your advice