New Member New Studio (ground up help)

Hey guys, new to the forum but im glad to be here. Im always around reading trying to learn. Im 20 years old, from london and i'm a recording/mixing engineer with a nice bit of success behind me. Family friends around me include Jimmy the "mixologist" and john themis, plus my dads been a working musician all his life. I've had a studio in my room for years, i moved out into my own premises, which was robbed...while i was inside the room so you can imagine the scenario. Anyway, a year later iv managed to get some equipment together but need some space to work in. So im going to build something in my garden soon. I have about 20x22 feet to build on ...MAX. Planning rights etc are all ok...we had a room back there before but took it down years ago. I have a budget of around 10k. I want the room to allow me to play music at night (reasonable level) without upsetting neighbours. It needs to have a vocal booth big enough for 2 people...and thats basically my starting point. Im doing a lot of reading on here but i cant tell whats right for me.... Will i need a floating floor? Should i make my booth out of wood once the rooms build or incorporate it into the building itself ie breeze blocks etc What type of air con can i use? etc It all comes down to my budget which as i said is around £10k. Labour is taken care of as its family doing most of the building.... Am i dreaming? Can it be done? Any advice is appreciated, im doing a lot of research but small tips here and there would really help. Thanks in advance