As an Etsy Seller I am struggling with Amazon’s “Add Product” process and ASINs

I have been selling on Etsy for more than 3 years and we wanted to start selling on Amazon as well, since it’s a bigger market. However, the complications of sign up process aside, even a supposed to be simple process of adding products is taking us weeks to solve. We were interested in adding products with bulks in a template, thinking that would be easy. Turns out easy is not in Amazon’s literature. Even adding a product manually takes some work, and the whole thing with ASINs and variations are confusing, and feels like they are not working how they are supposed to. Don’t even get me started on the Errors coming up with a Template. And the support feels like they are no help at all! I am just so overwhelmed, trying to find a way to not quit even before we started. How did you overcame these issues when you started selling on Amazon? Is it not a real issue and am I just not qualified to make this work? Thank you for your answers.