i think your best bet is to find the best teacher go around and check out the schools, see if you can sit in on a class. that way you know what your getting into
im sure the people here can point you towards some good schools in your area to look at as well
1. if you do wing chun, you wont have to worry about kicks for awhile especially not high ones
2. the mechanics of wing chun can be applied to all three - it depends on your teacher and what he wants to teach.
3. some schools have them, some dont
4. if you train and practice hard, you'll be able to handle yourself aptly in a street fight with a year or two of wing chun
5. depends on the schools you look at
6. as to completeness, with wing chun you can take it wherever you want to, but first you have to learn the rules before you can break them. it teaches you how to use your body in any situation. so i guess you could call it complete