I’ve got a three other bits of advice: First of all, get really, really good at woodworking. There are lots of people who enjoy it as a hobby. To sell your services, you’ve got to be able to do far superior work or do it much faster than everyone else (preferably both). Failure to do so means competing against hundreds of amateurs who make things for the pleasure of it, then sell their work at cost to fund the hobby. Second, develop great people skills. Most professionals do custom work and few focus on selling a product. Most of them sell a service, and a big part of that is getting customers to enjoy the experience of collaborating with a woodworker to create their dream products. If your customers don’t like you, they can usually save time and money by getting something from an online catalog. People who buy handcrafted items from woodworkers are often attracted to the idea of supporting artisans. The face behind the work is important to them. Last, develop an iron-clad work ethic. In this field you’re directly trading time for money, and that time is very limited. It’s important to be productive, so try to get 40 hours of actual productivity (as in making things) every week. Accounting, phone conversations and social media marketing may be important, but none of them provide an actual paycheck, so they don’t count as productive work.
Thickness planer. A thickness planer is used to fix surfaces of imperfect wood. If you are picking up less than perfect wood from the lumberyard, wood with some surface defects, a planer will let you fix that wood in the quickest time. A thickness planer pays for itself quick as it allows you to buy cheaper wood that doesn’t have perfect surfaces and fix it yourself. Be careful though. You loose wood during planing. So the remaining amount of wood still has to be worth the price you paid for it.