I live in Chiang Mai, so I will try to answer your questions...
1. Do you currently work in Thailand? If so what do you do - Is it worth buying a small business>
No, I do not work in Thailand... It is not worth trying to open a small business... You will most likely be in direct competition with Thais and you will be at a disadvantage at every turn... It can be done and I know foreigners that do run a business here, but it is fraught with issues...
2. Have you bought or do you rent properties? which would you suggest.
I rent a house here in Chiang Mai... Foreigners cannot own property (land) in Thailand... You can purchase a condo and own it outright, but if you want to own a house, it will be a problem... You can own the house, just not the dirt it is sitting on... There are ways around this, but is it really worth it? There is an old adage about foreigners in Thailand, never invest more in Thailand than you are willing to walk away from should a situation arise... I will leave it at that...
3. Have you made friend? If so with locals or expats?
"Friends" is an objective term, acquaintances would be a better term... There are a lot of shady characters in Thailand, most of which are foreigners... As with anywhere, it takes time to find close friends that you can trust... There is a large expat community in Chiang Mai and the Chiang Mai É«»¨Ìà Club is a good place to meet like-minded foreigners and to gain insight into the city and living in Thailand...
4. Did you have friends in Thailand before you moved?
I had a few people I knew in Thailand before moving here, but they are scattered all over the country...
5. What do you believe is a good monthly budget to have to live a middle of the range life in Thailand. (We love Koh Samui)
This question comes up often and my answer is always the same, which is, there is a reason the Thai government places a minimum monthly income for retirees at roughly 65K baht per month, per person... This is around the income level where a westerner can live a comfortable life style at lower-middle income western standards... Nice house, car, motorbike, food, entertainment, etc... Over time this figure has been proven out through polls, conversations, etc... Most expat families that live here can do so for between 60k - 80k baht per month... For the sake of disclosure, I spend roughly 100K baht per month, but live very comfortably...
Hope this helps...Â
Chok Dee...