I have had issues with the MVP2 collar preventing the tank from screwing down all the way. I use a regular ego thread cover or super shorty ego cone when I have this kind of issue. Covers up your junk and lets the tanks screw down flush.
I stay away from fiberglass wicking. Other than that it really depends on the atomizer. Silica will work in 99.9% of the atomizers. Some people prefer cotton, and some use Stainless Steal Mesh. If your just starting I would recomend Silica for a tank and cotton for RDA (Rebuildable Drip Atomizer)
Being new to building coils I would suggest 32ga. But always, Always check the ohms with a multimeter before attaching it to your device. should read between 2 and 1.3 ohms
Wire gage numbers go from 32 being thin and 28 being thick. The lower the number, the thicker it gets. The thicker wire is best for Low ohms 1.00 or lower, the thiner gage is best for higher ohms 1.3 or higher.
As lanab8 said do a youtube search for.. Rebuilding a "your atomizer" (insert your brand atomizer in the quotes) and you will find info for rebuilding your atomizer.