Hi there! Thanks for the question. Sorry if it took bit long, i'm no longer in the PPG fandom nor on DA that often.
First and foremost thing that you need to accept is that art skills take time to grow and develop. So don't rush it, go at it in your own pace, it's not a competition. Secondly, draw what you like and love, as frequently as possible. Best way to improve is to do it repeatedly, but with no stress. You can also try copying and analyzing your favourite shows/games/styles!
As for the tablet; don't go buy one early. Your skills won't and never will depend on you owning a digital device, it's all in your hand. It would you better for you atm if you train your hands to get used to drawing 1st then move on to a tablet. Tablet is only there to make it easier, but it's not a shortcut.
Hope this helps!