That question pretty much boils down to personal preference and what resistance you plan on making your
coils.
So here's my personal preference... I like to play with different setups and have wire gauges from 28 to 38... I use the 30 gauge more than anything, followed by the 32 & 28.
I also like stainless steel mesh wicks... #400.
There are lots of great
threads dedicated to every wicking material you could think of... Silica, ss mesh, cotton, hemp, bamboo and other stuff that isn't piping into my head at the moment.
Do some research and see what appeals to you. The good thing is that most wire and wicking materials are fairly inexpensive. So if you try something and don't like it you can try something else.
... Me for example... Thought cotton sounded like a great idea... until I tried it... but other people swear by it.