Moving to Chiang Mai - schools, condos, gym, internet etc

I am moving to Chiang Mai , I have visited the area once for a few days but dont know to much about it, need to go there for work

I like to go to school again for studying Thai and need to find a place to live

1. Advice on schools, courses etc to help learn the language I already have some background, can read and write some and speak but far from a pro

2. Advice on good websites to help find a condo to rent budget around 12000 to 20 000 would that find me a nice spot in the downtown or close to downtown area?

3. I want to be closer to the center area of the city, advice on where not to go?

4. I like going to the gym, I used to love CAlifornia wow (RIP) I dont need a gym with super body builder machines but I do like a nice selection of cardio, free weights and machines, much like California wow used to be and air conditioning is a bonus

5. What internet companies are up there and how is the speed

That is pretty much it, any suggestions or ideas or thoughts would be much appreciated

Thanks all

Kevin