I have an Igo-W and it is a great atomizer!
First, you need to learn about battery safety, especially since you will probably be vaping lower Ohms on the dual coil system. Read up on Ohms Law and understand what it means. Once you have learned which batteries can be used safely, figured out how many amps you will be drawing from you battery based on your build. I'd recommend any 18650 batteries with a high amp limit (20-30 amps). You'll also want to get a decent charger. I have a Nitecore and really like it.
You'll probably want to get a simple mech, as they really are the best for drippers, unless you are using a DNA 20 device. I'd recommend the Smoktech Magneto as it is simple, inexpensive, and works well.
You'll need building supplies, wick, wire, and a really good, reliable device/multimeter/ohms reader.
There is a lot to learn about RDAs and a million posts here on ECF to help you out and a million YouTube videos out there with building tutorials.
Hope this helps. Above all else, please do some research, learn about Ohm's Law and battery safety!!!