The first thing you'll want to do is familiarize yourself with Ohm's law. Basically what you're going to be doing is building a setup that vapes well, but that stays within the Amp limits of your battery. Do you know what kind of batteries you're going to be using? This is very important, as exceeding the amp limits of your battery can be very dangerous when using a mechanical device.
As an example. Say you're using an AW IMR 18650. Those have a 10 AMP limit, so you'll want to stay within that 10 amps. A good build for the Magma would be between .6 and .8 Ohms. a .6 Ohm build, according to Ohms law, will have you pulling about 7 Amps. The .8 Ohm build will have you pulling 5.25 amps (at 4.2 volts, a freshly charged battery). The trick is not to exceed that 10 amp limit, as your battery will get hot and bad things can happen....So lets say you're building for .6 Ohms. You'll want to build TWO 1.2 Ohm Micro Coils to equal .6 Ohms (remember, 2 coils cuts the resistance in HALF). That's the build I run in my Magma and it seems to work well. I also use Sony 30 Amp batteries which give you a lot more "wiggle room" to work with as far as staying within your amp limits....
But forget all that. For just starting out, you may want to just run 1 coil to get your feet wet. You can still get a great vape off of one coil, and it will keep your resistance up higher than 2 will....
Ohm's Law - The basics - Ohms Law Formulas Explained to save you time
Ohm's Law Calculator
Hope this helps!!
