Oh Man!! I wish all questions were this easy.
First of all, the Vtube kit is the best deal currently avialbale anywhere, so don't waste your time hunting around. Use the discount code Vtube30 and grab a stainless or chrome one while you still can.
They come with one battery. you'll need a spare. Go to Orbtronic.com and get the 2250mah Panasonic CGR18650CH. Get the gray one for $8 shipped. Don't get the spare battery on Apollo's site. It's o.k., but this one's cheaper and better.
Next, go to Gotvapes.com and get a Vivi Nova 2.5 Tank. Better yet, get a few of them. They're that good.
Then, pick up a box of 5 Fluxomizers from the same site. Get the 2.6-2.8ohm Fluxomizer Supreme XLs.
Other than juice, that's all you'll need for the next couple months. Fluxos last a very long time. The Vivi Novas have replaceable coil heads. Pick up an aluminum tank or two for the Vivi if you use real acidic juice like cinnamon.
Then get ready for some sweet, leak free, trouble free vaping.