I ran construction work when I was young, quite a bit bigger than chicken coups, lol We'd get a new guy on the crew, after a bit I had developed a little test that they didn't know they were taking. It was complicated and the details are irrelevant to this, but the answer is spot on. There were basically three answers: They could come back, tell me I was full of it, having done it right. This was awesome, that guy had experience, it would take some weight off, the best I could ask for. Second was, they could come back, tell me they did it, ask them some details, and tell they were BSing me, they had already wrote their last check. The third, they could go, come back, and say they didn't know, or just start asking questions on how to do it. That was great, there might be a little hand holding, but I could work with that. After a while I'd literally answer with "you passed", and personally go over with them and walk them through it, get to know them, because then they were worth my time.All of them . I’ve never built anything or used a tool.
You have the first and most important skill already. Admitting what you don't know. keep it and you'll learn fast and do well. My advice, would be just what @Bald Bee Man said, find you someone to get you rolling. You have the benefit that you will be your own inspector and customer, but you still don't want to get hurt, spending more in materials than you have to, or backtracking a whole lot. Heck, talk somebody into your free labor on their project, for learning and a little bit of pointing and hand holding on yours. When you get to the point of details, plenty of people on here will help you.
Option B, there are kits available, but they are pricey for my taste.
Building your own things is rewarding, good luck.