OK, now pretend you need to buy/rent a bigger garage which you will if you tried to do this for a living as you would need more tools, better tools, a paint booth, and to be able to buy wood by the bundle so you wouldn't have to schlep back and forth to the lumber yard. Then try to declare all that income and pay taxes. You'd need to be billing 50$ an hour to see 25 after taxes. Now buy yourself some insurance on your business, buy a website, pay a lawyer to trademark your brand. Might want to buy health insurance too for yourself and your family if you have one. You'll probably want to buy a forklift too to unload the truck that delivers your lumber and to load up freight trucks that come to ship anything big that you sell and need to ship. You are very fortunate if you can find a sheet of 3/4 anything for 30 bucks either plus you'll need to buy glue/screws cable and terminals, sandpaper, router bits, saw blades, respirator filters and other consumables.
There's a big difference between doing one now and again on your day off for a buddy and trying to quit your 9-5 to become a full time woodshop.
If you tried to do that 9-5 you would be broke and dying of liver failure within 6 months.