I personally found that focusing on movement before attempting to develop one's game sense(reads, combos, that sort of thing) is a good way to get started.
If you want to do a fastfall short hop, for example, then practice executing it in training mode for a while until you can do it consistently without consciously thinking about it. Having full control over your character's actions is really important.
The inputs that I personally struggled with were short hop uair and utilt because they're nearly indistinguishable. Find your weaknesses and work on eliminating them.
As for actual matches, experience is crucial as long as you figure out why you've won or lost. Tournaments between pro players and forums(smashboards,reddit, etc) are solid supplementary resources, but you can't rely solely on them to get better. Get out there and lose!..or win, but that might not happen very often if you're new and fighting high skill opponents. Treat each match as a learning experience.
I've been playing for less than a month, so, assuming that you're new as well, we're in a similar situation. I get it. The climb to the top is really daunting, but we will inevitably get there with enough time and dedication.