Protank atty has very small chamber to work with. If you are just starting out, I would suggest stick with single wire instead of twisted. Also, silica will last longer than cotton.
If you already bought 30gauge wires, just use them. No need to
buy something else. At 30gauge, 6 - 8 wraps on looped 2mm silica. This would be a good starting point. You can +/- wraps as needed.
Initial target resistance should be 1.5 - 1.8. This is generally a good range for most
juice.
Cotton will give you more flavor and vapor. However, it will burn faster and have to changed frequently. Changing wicks in Protank atty isn't fun.