You can go to the wire wizard part, but for the coil building area it's pretty simple. First, ignore the outer wire for the most part. Simply put what the cores are, the one difference you make is 2X the thickness of your wrap wire for additional accuracy. That should get you pretty close estimates.
As far as what resistance you want, there's a lot more to good vapor production than resistance, it's actually a more minor attribute. Wire types (fused claptons, alien, staple, etc are among the higher end), focusing on surface area, so a larger coil is good, more wire heating and touching the liquid soaked cotton. Lots of stuff about all this, but lets just say I have a .48Ω coil in my Avocado on a Noisy cricket and it produces comparable vapor to a .12Ω build I had on it before with a regulated mod.
As far as what wattage for what resistance, there's no hard rule. There is a formula you could use to find how fast things heat up, but there's a lot of variables involved, wicking will play a large difference and that's not going to be part of that formula. But, what I found a long time ago when I was going with premade coilhead tanks. .3Ω=70w, .5Ω=40w, and .6Ω=30w. Those aren't set values but starting points, from there you'll adjust upwards until you find your sweet spot. To further estimate I've kind of gotten a feel for the type of coil and mass and what wattage would suit it. The more mass the more wattage, the lower resistance the more wattage. Just as a nice rule of thumb.
One note for the premade clapton wire, 32g outer wrap is a pretty thick wire for an outer wrap, it'll take some time to ramp up. Just a heads up.
