Hi, I'm new to the board too! As a newbie, I think it's very tempting to dive into your pockets and start buying whatever product is being talked about that week. Don't do it.
Don't waste your money buying heaps and heaps of new stuff. This is what I recommend...
1. Know what ingredients are good for hair health and which ones aren't so good. Look through the things u have and you may find out that you already own some great stuff.
2. Next I would pick up some extra items at a grocery store (honey, coconut oil, olive oil, yogurt, eggs). You may already have them in the kitchen, if you don't and it doesn't work for your hair, you can always eat them. Use the search bar on the website to find recipes and uses for natural ingredients.
3. Set a limit for how much you want to spend on new products. I would probably buy 1 shampoo, 1 conditioner, 1 dc and 1 protein trmt at the most. If something in your current stash isn't working, replace it. I know the shampoo I used before finding the boards was really drying out my hair, i thought that was normal. now, i've found a good protein shampoo that doesn't dry out or tangle my hair. (sunsilk tlc hydra)
4. I really don't think products matter all that much. Hair will grow out of your hair no matter what you put on it. The key to hair retention is protecting your ends. I saw your YT vid and I would start with a good trim, just to get rid of split ends. then try to keep your hair up in a ponytail or bun so the ends aren't rubbing against stuff.
5. And lastly, some of the ppl on this board are way too obsessed with hair. I think its so funny when someone says they have a "simple" regimen and the details go on for 1/2 a page. you know your hair best. When it's dirty, wash it. when its dry, moisturize it. you get the picture.
It's really great that at a young age you care about your hair enough to make videos and take care of it the best way you know how. Good Luck!!!