Not sure how to be much help on your request. You would probably be best off to set down and make a list.
1. How much per hour do you personally need to earn.
2. A list of the machinery or tools your going to use
3. Then a guesstimate on how many hours you can run your equipment before it needs replaced versus its replacement price. Such as 20 or 40 hours a week for 3 1/2 months for 3 years.
4. Fuel, oil, weed-eater line,
5. Filters and blades, wheels etc for the season
5. Time and cost to transport it to the job and load and unload.
6.Insurance or business permits for your area ? Advertising cost if any. Someone doing paper work ?
7. Total hourly rate might surprise you. Many people think the resulting price is ridicules. Unless you’re doing it to make a living then it puts a different perspective on things.
8. Then you get to have another guess on how long it takes you to work the area the customer needs.
Many people seem to be surprised that a 30 to 35 horse power tractor can cost 30 to 35 dollars a hour to operate it. Plus wages and transportation, and paper work, insurance. Many high end lawn mower, zero turns and what not are not going to be different.
Then you get to decide if you want or are able to compete against people that are just wanting to earn spending money or are only going to be able to stay in business for a year or two before they realize something is not adding up.
For example there is a local retired person in my area running a bush hog to mow with and using a older 40 to 50 house power tractor. It’s impossible to beat or match his prices. Visiting with him one day I found it interesting that his thoughts were that he was earning some nice part time spending money and it would last until the tractor needs a major repair. When that happens he will go to full time retirement. The tractor and equipment he already had will have served a purpose and no loss since a replacement will not be needed.