As you are new to rebuildables I highly recommend you spend some time with Baditude (our resident battery expert) and visit his blogs.
Baditudes Blogs. The blogs regarding rebuildables are listed below. I included #15 -- it has some good links on rebuildable tools.
I omitted all of Baditudes blogs on battery safety as I am assuming you will be using your iStick which has a self contained battery. If at some point you purchase a regulated devise that needs batteries or if you get into mech mods, Baditude also has other blogs which are very helpful and cover these topics.
OHM'S LAW
14. Ohm's Law for Dummies (Vapers)
* My attempt at explaining Ohm's Law in layman terms and how it relates to vaping.
16. Explain it to the Dumb Noob: Ohm's Law Calculations
* As simple as it is to use, some people have a tough time grasping the concept. Warning: Includes graphic photos of mod explosions.
REBUILDABLES
7. Information Resources for Your First RBA
* An essential read and reference guide for someone new to rebuilding coils. Includes a multitude of useful links on battery safety, mod safety, coil meters, coil building, and the differences in the three types of RBA's.
15. Inexpensive Mechanical Mod and RDA Setup
* A response to the frequently asked question on how to get into rebuildable atomizers with a mechanical mod inexpensively. Includes a list of commonly used tools and supplies for rebuilding and where to find them.