Hi doc,
welcome to this forum 🙂
iMovie is an edit app meant to work with firewire connected miniDV camcorders
* miniDV (not miniDVD, beta sp, flashstick, mp4, whatever...)
* firewire/iLink/IE1394 (all same), not usb2, cradle, whatever.... ask the store, wether a fw cabel is included or buy one (3$ for a short one, 4-6pin)
* stay away from "exotic" brands, Sony is a very good choice (I do own one)
* you just need usb for downloading any still-content, in case your new camcorder is able to do so (storage on memorystick, whatever) and you want it
* you don't need any additional software, your Mac has all you need
* you don't need any "special effects" in camera - you will do that with your Mac
* get another additional battery
* get a tripod
* get lots of cassettes
* set camcorder to 16bit audio
BOOM!Done...
have fun! 😉