My combos with Young Link consist of almost entirely a down throw to utilt. Depending on the percentage and character, I can sometimes get some more utilts in and then try and nair (though I suck at the nair, usually comes out as a fair) to boomerang. another nair/fair, and to my shame, if they're high enough, most of the time I try and use the Up+B. I would love if there was a science to making that a useful aerial weapon.
So, basically my typical combo looks something like this (when I'm playing well):
grab -> hilt strike -> dthrow -> utilt (repeat as necessary) -> nair/fair -> boomerang/bomb -> nair/fair
Depending on the percentage/opponent, the nair/fair and boomerang/bomb part can really continue as long as the opponent can't DI out of it or recovers quick enough. Too bad Young Link doesn't have a good aerial spike, or else you could get really nasty around the edge like Marth does.
Just so we don't have a seperate thread, how do you guys often approach your opponents in general? I haven't really seen a thread dedicated to combos and approaches, which seem to be a difficult, if not crucial part of Young Link's game. Also, the projectile guides are nice individually, but something that pulls all of it together would be excellent, like how to string them together. With my Young Link, for example, I have a hard time going from run-and-shoot to shoot-aerial-shoot-aerial and such forth. Also, I don't know nearly all the boomerang physics which it seems most people have to experiment with.
Note: A bit of this is theory, since I'm not really too good with YLink or my adv. techs.