@FandomQueen YCH's means Your Character Here. They are basically sketches that, when bought, the artist will draw your character in that background/pose.
For tablets, I suggest to
not get a Huion tablet, and instead invest in a Wacom. Bamboo's are the cheapest, but they also have different types that hold more options. The prices can go up in the thousands depending what you want though so just be mindful! There are also three sizes. I recommend a small if you have one screen and a medium if you have more than one computer monitor or have a large screen. I have a large tablet and even with two screens it's a little much haha.
And also for impress mes, most of it comes with practice and writing/art/coding skills. However there was a really nice forum somebody made with tips a while back so if I find it I'll link it here.
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I'll also post an art piece I made of Tori so it's not just a reply.

I love animating my little girl ahhhh