I would highly recommend starting it out of your home in your spare time. As others have mentioned this is the safest way to go. I have two local dealers here in Colorado who have very nice showrooms in their homes which allows them to spend money on inventory instead of rent, you can find both on the web, not sure if they will give you any advice but worth a try.
BTW, even the hardest 2 channel guys are moving to HT as custom installs are the highest profit of all and often the client is not fussy about components or budget.
BTW, even the hardest 2 channel guys are moving to HT as custom installs are the highest profit of all and often the client is not fussy about components or budget.