Hi Ben. Grats on your acheivement! And thank you for discovering electricity.
Let me state at the start, that any tank that uses polyfill (cartotanks) or silica string wicks (clearotanks) may have issues with thick or dark colored juice. You may need to dilute your juices with some distilled water to make them less viscous.
I generally recommend new cartotank uses to try a complete tank kit from either My Vapor Store or IBTanked.
The 3.5 ml Pro DCT tank is a slimmer tank that would go well with an eGo battery. Along with the tank, you'll get a drip tip mouthpiece and your choice of five cartomizers. For a Twist I recommend getting 2.5 ohm single coil cartomizers. $21
510 Pro DCTank Combo

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Or, the pyrex tank (19mm diameter) called IBTanked. You'll get the tank, a dual-purpose drip tip/tank accessory tool, and the appropriate length pre-punched carto. $25. I suggest getting additional pre-punched cartomizers, which are available on site.
https://www.ibtanked.com/complete-tanks/stainless-steel-setup


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Here's a cartotank setup guide that I have prepared for new vapors:
http://www.e-cigarette-forum.com/forum/blogs/baditude/3710-5-cartomizer-tank-setup.html
This picture dictionary of the more common juice delivery devices has basic information on cartomizers and cartotanks in general:
http://www.e-cigarette-forum.com/forum/blogs/baditude/3230-1-proper-terminology-carto-tank-what-primer-juice-delivery-attachments.html
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Be sure to match the proper length of cartomizer with the tank length you choose:
