Individual states grant notary licenses and once you are certified, you can create a notary and/or a mobile notary business. You can then charge for you services as well as travel expenses. This can be really valuable for customers after hours or on weekends.
Requirements are minimal – 18 years old, English reading and speaking, US citizen or resident, live in that state or have a place of employment in that state.
In Washington, the process is to go the the WA DOR site, download the Oath of Office form, get it notarized, purchase a $10,000 Surety Bond for $45 to $85 and pay $30 for the commission. Follow the mail-in or online instructions on the DOR site in your state.
Taking a big step forward is becoming a Loan Signing Agent. This is the person who walks you through the giant pile of loan documents when you buy a home mortgage.
You can make $100/hr part time. Plenty of trainings are available.