utilt, great against fast fallers/heavys.
throws, a general rule of smash is that throws are awesome, use them lots
utilt>grab(hey look, they go together), yeah kirby doesnt have a lot of combos so you take what you can get. The uptilt is kirbys only real combo-able move and it really only leads into more utilt or an ariel.
I myself am a fan of the bair approach in that you approach your opponent facing backwards or you can just wavedash forward into a quick DD to face backwards and then wavedash backwards. Its significantly easier than it sounds.
Other random things, ummmmmmm, the fourth hit of kirby's fair has very little knockback but enough stun to lead into a grab. Also Ive found that those not familier with playing against a kirby arent particularly good at teching a uthrow, especially if they're playing a Fast Faller, so if you can get a grab i might suggest a Uthrow>fair(fourth kick>Grab, just dont expect it to work for very long. Also, Dthrow on platforms, makes it really easy to tech chase.
Other basics, tilts in general are usefull, know your stage counterpicks, ledge camp ALOT, dont get hit, and mindgames, you should learn them. Other than that its really all about practice, practice, practice. Learn the basics(general basics, not just kirby basics) and just practice untill you dont miss them ever. So when your doing a kirby ditto with t!mmy you dont accidently air dodge yourself off the stage >_>
. Ok lets say there a pokeball in the middle of the stage and you and your apponet want it. Running A can get the apponet away and you a pokeball :D Yay!
