I would recommended you to get it separately and not in a kit, as you wouldn't use all the things that is in the kit. I'd suggest you to get an ego twist battery, along with a vivi nova clearomizer and a usb charger. That's all you need to get started (which is what i got when i first started). Except for the vivi nova, I got a Stardust clearo instead but I strongly suggest you get the vivi nova clearo)
You might want to get 2 ego twist batteries instead of one, so you wouldn't have to worry about charging as it takes a few hours, and you would probably turn to analogs during that time. As for juices, go for 5mls to try out different juices. I was stupid enough to get a couple of 50mls of the same juice which I thought would be great as I love that flavour in other forms. They ended up in the bin