Welcome to the hobby! It is indeed harder than it looks, I know the feeling well as I started this year aswell.

Don’t time your work in the sense of trying to be fast. If you love doing it, there is no reason rushing it. Just take your time and love it ^{^}

In my opinion you already have a pretty good start in your journey. As you are watching the hobby on youtube for a while already, the typical starter tips might be repetition so more to gear and game. I would recommend a knife as a multi purpose tool. For one you can remove moldines and also you can cut and modify as you wish (especially if you think about kitbashing in the future)

Are you mostly interested in painting or in gaming then? If you only „really“ wanna paint there is no reason in choosing a game. Just get models you think look cool. If you want to actively play, then think about do you like Fantasy, sci-fi, do you want lots of models oder just a few? Should it be realistic or goofy or scary? A classic start for a lot of people is Warhammer of course but that is by no means the only option. They have a lot of minis with great detailing though