Well, while i am rambling........
What are you going to charge and will it be by the job or hours spent? How much will you markup parts. Will this small business need to provide a living wage or supplement other income or a hobby business? My ex-brother in law is one of the best welders i have ever met. He does artistic welding. His TIG work is amazing. He decided to start a side business doing welding. He spent over $10k on equipment. He priced his services so low just to get business it took him years to pay off the equipment and he actually cleared very little. Great welder but lousy businessman. A friend retired and opened a coffee shop by using his retirement savings and promptly went bankrupt. Never use retirement dollars to start a business. Especially pre-tax savings dollars. The 2 John Deere/Stihl dealers near me both charge $98/hr. I don't need to charge that but i do need to cover my expenses and make a profit. You need to figure in many costs that go into your overhead. Tools, shop supplies, parts, insurance, advertising, mileage, office supplies, website, phone, etc. Many people start a small business and charge $20 an hour if they want to clear $20 an hour but in reality after taxes and shop overhead it is more like $40 an hour to clear $20 an hour.