Your questions can’t really be answered in a forum post. There is no “formula” per se for how to start any business, let alone a yoyo company.
There are plenty of resources online about the basics of starting a business. Stuff like finance, business plan, licensing, marketing, etc.
I will say that without a background in manufacturing and design that this is going to be a much tougher road than most think. We help out a lot of yoyo startups and there are little bits of knowledge that are required that most don’t have. For example, do you know how to specify tolerances to your machine shop on your design? Do you understand just how small .0001" is and how that relates to making a yoyo? Do you understand the limitations of CNC machining as it relates to your design? Etc.
Making yoyos is really difficult. The tolerances and the customer expectations for smoothness are really high.
I’ll give you the single best piece of advice that I have learned from owning a business for 13 years:
Everything costs more and takes longer than you think it will. This might as well be a universal law of business.