ok that video was so helpful THANK YOU!! just one last question... is it either cartridges or juice? OR BOTH?
There are 3 basic ways to add your e-liquid....(1) carts+attys; or (2) dripping; or (3) cartomizers. With carts, you add your e-liquid to the filling material inside the cartridges which then, in turn, fit into an atomizer. With dripping, you drip your e-liquid directly onto the "bridge" inside the atomizer and use either an empty cart or a drip-tip as your mouthpiece. The third method combines a cart with an atty into one unit, where you add the e-liquid directly to it with a variety of methods.
If that sounds like a bit too much information for now, my suggestion is to be guided by the type of ecig you eventually decide upon and start with one method, and experiment with others as you go.