Once you've got a time frame in place, you need to get serious about becoming a legal business entity, keeping tax records and financial documents organized, and having adequate space in which to work from home. If you haven't already, look into the options for legal business structures; you can choose anything from sticking with a simple sole
proprietorship to forming a C
Corporation. All have different benefits, drawbacks, requirements and, of course, taxes. Get professional help if you're uncertain about any of the options, because this is one thing that needs to be done right.
Along with your legal structure, you'll also want to take some of that transitional time to make sure your home office is set up for productive work. If you're having problems getting quiet time, private space or regular hours to work at home, you'll want to start figuring those problems out now and working on a solution.