I wouldn't really call myself "pro", but i'll add my 2 cents anyway.
Toon Link's custom moves are mostly inferior to his default moveset, there's a few interesting things you can do with some of them such as some insane recovery utilizing the short fuse bombs and some stage control with fire arrows, although the default moveset is generally considered to be more effective overall.
In general the most effective way to deal damage as Toon Link is to abuse his ranged options, spamming boomerangs, bombs, and arrows, and making good use of zairs, aerials, chain up tilts at low %s, neutral 3 hit combos, grabs etc.. when forced to get up close.
With Toon Link, you'll usually need to get opponents to a bit higher % before you start thinking about killing as he doesnt have the greatest KO power, although when you are ready to go for the kill, his fair, bair, smashes and back throw are all effective ways to land a kill.