Now with some insight, do a spreadsheet exercise for the purpose of determining overhead.. Here are a few thoughts.
Driving to get materials: miles roundtrip at 55.5 cents per mile [IRS determination]; time at driver's rate of pay, say $8.00 per hour [minimum wage without withholding as you would for an employee]. Delivery time and mileage as well.
Design time at $25.00 per hour. Paperwork time at $15.00 per hour. Construction time at least $30.00 per hour. Drying time doesn't count. Marketing time at a 10% commission in selling price to myself. Profit is on top of that, as is ROI on the shop and its equipment.
For materials, include clean-up for finishes and such, sweeping the shop, etc. [time is $8.00 per hour]. Think in terms of hiring someone to do it. I estimate construction time by the number of pieces, including hardware, that go into the finished pieces. They all need 'handling' of some nature. My estimate in my shop is 30 minutes each, which includes sanding and finishing, fiddling and fettering, installing and fine tuning, to get things just right. I got that number by actually building a small piece and timing, with a stop watch,
every operation. PIA, but I learned an awful lot from that exercise!
Now, we may not be able to get that as we build the business, but we need to plan to get that. And in the beginning when jobs are not piled one on top of another is a good time to work these exercises, so we know for the future.
There is much more to overhead - think sandpaper, glue, light bulbs and shop toilet paper for starters. If the business is to be successful, then none of these things can be overlooked. Unless you want to use worn out sandpaper for toilet paper! Don't forget utilities. Use a copy of Schedule C as your worksheet. Learn what applies and keep records on those things.
Understand how the IRS impacts your business. What is deductible? What does self-employment tax mean to you and how much is it? How are you handling your records so you don't pay more in taxes than you ought to, or less than you need to and then suffer the consequences. Getting laid off it one thing. Building a business is another. Having the government destroy the business because you haven't paid attention to the bottom line with them is the final straw. We KNOW the Feds are not here to help us.
Been there, done that with all of this. I am not offering opinions. I am speaking from personal experience. Advise? Stay in front. Be prepared. Don't guess. Don't 'wait' to find out. Be confident and get what you are worth. The jobs will come. People invest their money with folks who know what they are doing. After all, how may of us have said, we don't mind paying a little more to get quality, piece of mind on a job done well and completely done, with someone we can trust. That is why we ask for recommendations from our friends. Now we get to be the one who is recommended!
Remember to keep your sense of humor in tact as all this can get very frustrating. But you are worth it so do yourself proud!