KF 5 is never going to be a great cloud
tank, although the airflow is a lot more open than prior versions. I would start simply with maybe 26G or 28G Kanthal (whatever you have) wrapped around a 2.5 mm drill bit/something that size. Use Steam Engine to calculate the wraps
Coil wrapping (don't worry about the leg length, just the gauge, type of wire, resistance you want, and the inner diameter of the coil. So a simple build could be an 8 wrap 28G 2.5 mm ID Kanthal coil ~1.5 ohm. If you want say 1 ohm, it would be 5 wraps.
Easy to mount, large enough to be easy to wick, and should work just fine. Besides, if you're using a regulated
mod, resistance isn't a big deal as you can adjust the power to what is appropriate to the vape you want. You can use thicker wire and get lower resistance for a build, but as you're pretty new to building, start simple, get the positive feedback of something working, then feel confident varying your build to get even better performance.