You don`t actually require a business plan unless you`re asking for funding. Banks want to see one, and so do investors. If you`re funding this yourself, you don`t have to have one, but most books I`ve read suggest it`s a good idea. Write out the whole plan like you were going to ask for a lot of money to do it. Looking up a business plan model and finding all the information that goes into one before you start can only help. You`ll think of things you didn`t before. You`ll be forced to make changes to your mental plan, in favor of reality. This is what`s happened to me as I started my business plan. It`s more than a banking tool, it`s a good strategy to work from - a business constitution.
If you own a home, maybe you can get started cheap by working out of your house. It`ll be less expensive than owning two buildings. It`d also cut your cleaning in half, since you`d be cleaning your house when you clean your workplace, instead of cleaning one and going off to clean the other. If you`re not in a good location for it, I`d imagine a small building with the necessary plumbing on a busy street would be nice. Maybe you can find something on the primary work commute. If people can drop their dogs off on the way to work, that can`t be bad for you.
Making limitless possibilities much more limited.