AIR TREATMENT (Air Con / Extractor / Dehumidifier)

hi, i am looking for a bit of advice here! i am currently converting my garage to a studio and i think ill need some sort of air treatment. the studio itself is more of a residential extension than a professional studio due to building warrant and selling on purposes, but i did try to keep a happy medium. anyway, the ventilation currently consists of free attic ventilation through soffit vents and an external window (that i want to keep closed). with trickle vents. i think i need an extractor fan for smoke if nothing else. i was thinking of using some sort of 'typical kitchen fan extractor through my ceiling but i do not know if this is the best option. does anyone have any recommendations other than the above or ducted a/c.