Other side of the coin: 'liability'.
Something happens, even if not reasonably 'your fault', someone sues you, and you might spend every one of your young family's last dimes on defending yourself. Even if you prevail. Form a legal entity (LLC, Subchapter S, etc.), get some basic insurance, etc.
You may well find that your homeowner's insurance excludes business activities on your property, as well as any liability coverage, or theft of your tools and equipment. Your vehicle insurance similarly, if you hit someone, or get hit, with a load of firewood. I even carry basic work comp insurance on myself (optional) which protects me if I get hurt even while traveling to and from a job site.
Keep records and you can deduct vehicle expenses, fuel, insurance costs, etc., and even operate on a 'loss'. You can sell your equipment to your business and recover some of your investment.
Helps to have a lawyer and an accountant; just the exercise can help you figure out what your time and effort are 'really worth'.
In Minnesota, we have agencies designed to help small businesses get started, I am sure that WI does too.
https://mn.gov/deed/assets/guide-starting-business-minnesota-35th-ed-2017_tcm1045-155254.pdf
SCORE is also a good resource:
https://www.sba.gov/sites/default/files/resource_files/WI_SCORE_Offices_3.pdf
https://www.score.org/content/take-workshop
Philbert