You put in a lot of work and read posts and watch youtube videos... MK has one of the lowest learning curves at LOW level play. Kirby appears to be or at least was generally agreed upon as the lowest all around. This doesn't mean it's easy to play competitively, just that it's easy to learn. Now you are trying to pick up a different vastly more difficult character. Get ready to read and practice a lot.
Here would be a good place to start:
http://smashboards.com/threads/supe...-combo-thread-defensive-tire-play-new.295116/
Thanks a lot.
It's somewhat outdated for the current meta, but you should learn all of these things if you pick up the character anyways at least for competitive play.
Also, I'd recommend playing the character and learning his general abilities/flaws first. One way to do this for most characters is to set yourself to 300% and fight cpus and 0%. This helps with spacing. It takes a reasonable amount of skill and ton of patience but it helps.