Generally I would say just practice spacing f-airs, timing your jabs, grab combos, get familiar with the timing and duration of his moves (n-air, f-tilt, d-tilt, u-tilt mostly, since they have odd timing compared to most characters), practice light shielding so you can get the hang of when it's good to use and when it isn't, try mixing weak aerials to strong ones to maximize your punishes, tech-chase with wavedash, edge-cancelling aerials off platforms, try out different edgeguards (he has a lot of options but few guarantees usually). That's all I can think of off the top of my head.
If you need help with matchups you can ask about 'em in the matchups thread.
G&W for life! leave a reply please and have a nice day!