Pro-Tip: Start with drawing comics. Those are the starting point if you want to animate stuff. After you have a comic of whatever you want to put out as a movie clip, you can start to animate things. In my opinion, it's useful to have at least some audio at an early stage, but if you don't want to use audio, start by making a video of your comic images while playing some music as the background. Then start adding additional scenes, and animate as the last step. Start with the big picture, and not with the details.
Also, you don't need to go higher than 10 frames, if you do animation. Higher framerates usually don't make it look better, but are much harder to draw. You can go 24, 30, or even 60 frames, when you're rendering stuff, but not when you're drawing by hand. It's not neccessary, is a waste of your time, and you'd be better off, if you read a book about how good animation is done instead of just drawing frame after frame after frame.
>dude blender takes ages to learn if you don't have experience with some other 3D software
It's getting easier, and the UI is getting better. One reason why I'd suggest learning blender is, that it approaches an all-in-one solution. You can use it for 3d animation. But you can use the same workflows for 2d animation. You can also use it for video editing and composing. Or audio composing. Or general artworks like scene creation. Or you can simulate all kinds of things to get realistic effects. Liquids, smoke, softbodies, physics, fabrics, explosions, lightning, and so on. You can even click together games in the older version.
I'd expect rather months to learn the basics, if we're talking about modeling and animation. It ain't that hard, but you need time until you got good workflows.
Honestly, I have no idea. I have a totally cheap tablet which I'm usually not using, because I don't draw much. A friend of mine has some very expensive professional tablet. His is nicer and looks and feels much better. It's a nice, solid thing, which looks all expensive and professional and serious, while mine is nothing but cheap plastic, and not serious and professional at all. He, on the other hand, paid over 500 bucks for his great and professional end extremely serious tool, while I got my cheap toy for 10 bucks on ebay.
Don't think, that it makes a difference. If the pressure sensitivity of the pen is high enough, it's usable.
If I had some money to spend because I want to create some animation, I'd buy a good graphics card and a good microphone and soundcard, and think a bit about soundproofing.
>There is 6 gorillion tutorials about "Grease Pencil" on youtube and you can start watch them right now.
I'd like to stress, that the 2d animation features are new since 2.80, which came out at the end of last year, so most videos on youtube with grease pencil in the title won't be of any help. Only 2.80 videos will be of any help.