Learn the basics,
How to move (Dashs, Backdashs, Jumps, Rolls)
Which character does what (Basically, it is a hadotrap, mixup, pressing character, with which moves, why is it efficient, how to counter each move, etc)
Choose 3 characters you like and start to learn them in depth, the frame data, which move must be used to press, to fight pressings, to anti air, ...
Find optimized combos and start to learn them, at first without meter and start to learn a new combo when you're able to do the one you learned 10 times in a row without dropping them on both sides, from each type of opening.
Start to understand how the match ups works, which move, strategy is efficient against this character etc.