for starters the Aspire Breeze is a great and cheap start.
coils are cheap if im correct, you can use any juice in them so you're not stuck to JUUL cartridges.
rechargeable via usb, or you can get the portable battery pack that'll charge it.
easy to use if im correct just click and go, it's also small slim and easy to move around. not clunky like most mods and tanks.
these are great guys for information if youre looking into doing a little research