Jarod,
I know you are excited, but stop and think this out. You are going to be a full time maker. That is a business. Do it as a business. Think like a businessman.
Get a license.
Get a business location that is legal.
Have enough space to work.
Work a regular schedule, free from weather and other restrictions.
Keep records, pay taxes.
Understand that being a full time maker is hard. It requires not just making and selling a few knifes, but hundreds of knives a year. Year in - year out.
A 10X10 is fine for a home shop with an "L" bench setup, but would be insufficient and unsafe for a regular work schedule.. Extension cords work when you are on the patio or balcony on the weekend, but aren't proper for a full time set up.
The power from a hallway socket in a storage unit would be 15 amp, most likely. You couldn't run much equipment on that without popping breakers regularly. The dust, noise, smell, and inconvenience of a knifemaker working at a storage unit would quickly get you a cancellation of you rental contract. The fire marshal would have them cited and closed up in a moment.
You need to rent some space in a place that is made for working - and legal. Here are some ideas:
An industrial shop unit ( often used as car repair shops), sort of like a workshop version of a storage unit. They are usually from 20X20 and up,have proper power, and are approved for business.
Rent a garage.
Rent space in an existing shop. A corner in a place that has way too much room.
Rent some rooftop space ( with full disclosure of its use) and build a storage shed for the equipment.Use roll out mounting tables for the big tools.
Move to the country.It is much cheaper than the city, has lots of space. you can run all the equipment you want.
Stacy