Yes you can use iShare on any generation of iPhone. You can download iShare and many other fun and interesting apps, like Angry Birds, on the iTunes store!
You can find an ishare application for the iphone online at various sites. The Apple website has applications available for the iphone at no cost. You may have to provide some information about your device in order to download the application.
yes the iphone is easy to use!
how to use vocalive in iphone first time
you do not ( you can not do that )
yes, you can just use wifi access to use the Internet on your iPhone
yes
will an iphone 5 will use nfc
not yet, but it will be coming out soon for the iPhone
no you cannot use ipod and iphone apps on itunes, but you can buy the apps on itunes and put them on your ipod and iphone
No you both have to have an iphone 4 :)
the best way is to use the find my iphone app
yes