Wow when you said taking the plunge I thought you were getting married....or enlisting with Uncle Sam.
On any business I always recommend do some homework on your field, competition, pricing, inventories all of that -and- the basics of how to run a business.
One teacher I had wrote a management book based on three very basic principles, works in a broad range of businesses, I never forgot them, "POC":
Plan, very briefly get a business plan, get as much information on both your business like the equipment and supplies needed and how to setup and run a successful business. There's a lot of good information online and other places to help here. Put your plan notes down on paper to give you something to work off of and compare with actual results.
Organize your plan, put the wheels in motion, get things like your basics like advertizing, marketing working. Hire help or go it alone? Supplies, overhead, operating capital (seed money) all of that.
Control, compare and check your results against your original plans, make necessary changes as you go, tweak things, throw out some things if necessary. Check your finances to see if you're on target. This can be your feedback loop to revise your plan as necessary.
Just keep thinking "POC" keep it simple but effective.
I've seen text books and teachers who teach 4, 5, 8, 10, 11 steps to management, I feel you can get all balled up with all of those steps.
Just a few thoughts, I was in school for a long time and working a lot more, most all in front line or upper management.