You're Toon Link, so most of the time you don't approach, but use your projectiles instead.
SH airdodge -> Zair is easily read, but not *too* punishable if you space it correctly.
TL is pretty slow compared to other characters; his fastest attacks come out on frame 6; these are Bair, Nair, and Jab. I forgot how many frames there are before you jump, but there are quite a few compared to other characters. So you CAMP the heck out of them instead.
So TL, most of the time you'll find yourself constantly moving around; jumping, releasing arrows, pulling bombs, throwing boomerangs.
Mostly you'll use an airdodge -> Zair to cover your landing so that you won't get punished.
If you're going for the kill, you're going to have to use your sword. Bair can start some things, since they're diagonally up and away from you. You can either throw some boomerangs/bombs in their general direction to rack up more damage, or try to land another aerial.
Nair, Uair, Fair (fair is really strong)...
And for ground options.... obviously, TL doesn't have very good grab game. Jab for spacing (right, guys? check me on this...) and Utilt is our most reliable killer. USmash is for killing too, at a slightly lower percent, FSmash is generally not too good.
So you're new, right? Read some of the stickied guides. And next time, post things like this in the Q&A thread.
Oh yeah. Keep Dairs to a minimum.