It's great that you are showing interest in the Zelda series! I hope you stick around here and try some other games too.
I don't remember exactly, but believe we have some kind of rule against talking about or giving links to emulators, but I don't quite remember. Just keeep that in mind for...
Link's probably like 5'8 as an adult. Maybe a few inches taller
Ganondorf is probably like 6'6 but I know it's somewhere in Hyrule Historia. Actually I think they all are probably, but I bet Child Link is around 4'11