Yeah, make damn sure you take the time to learn what it is you are buying, and know how to use the gear. Or pay someone who knows how.
I honestly mean no offense, but not having experience with recording (which seems obvious by your questions), makes it seem that it is going to be a big challenge/expense that you may not be ready for, nor have the skills to make it profitable. Recording is not made easy by having good gear. It takes much more than the equipment to achieve quality product. And 20-30 grand, is not near enough in gear, to bring in top level artists. About the right amount to be an established home studio, if you have what it takes to use it well.
Again, I am not saying you cant do it, but jumping into owning a studio, without first learning the 'ropes', just is not going to work out well.
You have not yet stated your experience, nor what it is you wish to accomplish with your studio. I am always here, willing to help in any way I can.