I'm certain a mod will move this to the appropriate forum.
First of all, welcome to the forum. I'm pleased that you are asking questions here and not just blindly starting a build on your own.
Building your own coils requires having the
essential tools and supplies, knowledge of
mod and battery safety, a
understanding of Ohms law, as well as learning the skill of wrapping coils. There are no shortcuts to be taken when it comes to building your own coils.
Do you already have an ohm reader? If not, don't even think about making a coil yet. This is an essential tool. You have to know the resistance of the coil you make to use an
Ohm's Law calculator.
You need to use an Ohm's Law calculator to determine the current that it will draw from the battery. Drawing too much current from the battery can cause it to go into thermal runaway, an irreversable meltdown of the battery. You don't want that to happen. Batteries and mods have been known to blow up due to user error and ignorance. There is no margin for error.
Having gotten that out of the way, 28 gauge wire is an excellent gauge for this application. Below is a video on how to build a dual coil microcoil build on an IGO-W. You can use a
coil wrapping calculator to give an estimation on the number of wraps to use for either a single or dual coil build.
I recommend just doing a single coil for your first build just to keep things simple. Remember, always check the resistance of the coil on a meter before you actually fire it under power. Any ohm lower than your target resistance, stop and make another. I recommend a target resistance of 1.0 ohm initially.
Use this blog as your resource:
Information Resources for Your First RBA Good luck, and always vape safely.