studio production. my sis has event promo company...any advice
Depends on demand really,if there are many musicians struggling to find studios then it's a good idea otherwise being a promoter is better and you could work with your sister in terms of marketing.
Music production for many starts as something to fulfil passion not really as a business venture and if has to be a commercial studio then it's too involving, you need to identify talented up and coming musicians and make them big so you need to look at your market first.