Good to see you seem to be taking all the feedback as positive advice and not personal.
First off, I think education is important. So the following is not meant to slight its importance. However, a diploma or degree is no guarantee for success. Since I have been involved with small businesses most of my adult life, I can tell you that success is the result of drive, hard work, innovation, and tenacity; formal education helps, but cannot be substituted for these qualities. Grammar will not improve your gear, and ultimately the quality of your gear is much more important than how well you write.
About 50% of small businesses fail within the first 3 years, and over 70% within 10 years. Not to discourage you, but if your business does not make it, a good education will help you find something. Diplomas and degrees may help you get your foot in the door, but you still need to prove yourself. Hopefully you will not be one of the 70%. And I applaud you for your effort, especially at your age.
So what is important for you right now? Probably to define what you do best and concentrate on those strengths/skills. If it is gear design and/or building the gear, concentrate on that. Get help on the other stuff if you can.
Okay, the site needs work. That is fairly easy. Even if you clean it up yourself, the site is not the most important thing at this point of time. There are some successful cottage manufacturers with not-so-good sites. They sell most of their gear via word of mouth, such as testimonials on BPL.
Now, lets talk about what you do best -- your strengths. Is it designing/building gear? Are you really good at the wide range of products you offer? Most cottage manufacturers specialize in one type of gear, maybe two. They are really good at one, maybe two things. Then after time, some expand their offerings after perfecting the base offering. Some never expand their line, just refine the product over time. Even some of the large "mainstream" manufacturers started out with one product. So analyze what your offerings are. And know why someone should buy gear from you, not a competitor.
Go for your dream and good luck.
Lastly, what differentiates your product from the competition? Why should someone purchase gear from you versus someone else? Value, price, convenience, unique or innovative?