I realize that it's been a while since you posted your request, but in the event you're still interested in receiving some guidance on the subject, here's what I'd recommend to do.
First of all, there will be no straight line from your current level of operations to turning this into a full time business. It will be a process, which likely entails multiple steps, including cleaning up the mess concerning your historical financial records, or should I say the lack thereof, conducting a feasibility study/developing a business plan, and creating a proper legal and organizational structure that would enable you to accommodate investors.
You mentioned that you have no financial records, but reinvested all revenues from operations back into your business. Are you incorporated, who owns the machinery, equipment etc. Have you declared any income from this side business in your tax returns or a corporate return? (don't answer that in a public post!).
It sounds like you're somewhat successful operating this business, so it may be worth taking a closer look at if it's possible taking it to the next level.
No matter if you continue to operate your business on the side, or if you take it to next level, you should absolutely address the issues you mentioned in your post.
If you're interested in discussing your options in greater detail, please send me a PM and I will see if I can give a few pointers.
I hope this helps.
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