The process of building a studio depends on the services you are going to provide.
First: Determine the type of services you will provide
Second: Decide the type of opperating system you will use. Most music production is done with computers now.
Third: Research your equipment (MAC/PC, Audio Interface etc. before purchasing to make sure it’s compatible with your operating system.
Fourth: Always keep in mind that the industry is always changing so make sure your setup is not a dead end and you’re able to upgrade or expand.