Clearomizers are the simplist juice attachment available. That's why I recommended them to you. Pretty much as you saw, just add juice and vape.
Just be careful when purchasing clearomizers. Some are ego threaded and will only work on ego batteries. Some are 510 threaded, and will work on 510 threaded mods like mechanical and regulated mods. Both the iClear 30 and Protanks are 510 threaded.
http://altsmoke.com/accessories/clearomizers/iclear-clearomizers.html
Most clearomizer tanks, or clearotanks (same thing), will have replaceable coil heads which are offered for sale alongside the tanks themselves. The tanks can be cleaned with the same coil heads for prolonged use. Eventually the coil heads will need to be replaced. Once their vapor production falls off or they just stop working, you'll know.
You'll be able to find You Tube videos on how to clean each tank available, and how to replace the heads. I've gone two months without needing to change the coil heads in my four iClear 30 clearomizers. YMMV as I've read of people needing to change their heads every couple of weeks.
Below is a typical "how to" video.