Some things you'll need to prepare.
1) Learning "Ohm's Law" and "Watts Law" or get a basic grasp of them for safety. Mechanical Mod you'll use "Ohm's Law" formula, Voltage/Resistance=Highest Amps you'll pull, 4.2v is fresh charge on a Liion battery, so example 4.2/1ohm=4.2amps, 4.2/0.5ohms=8.4amps, 4.2v/0.25ohms=16.8amps. Regulated mod you'll use "Watts Law", Wattage Setting/Lowest Battery Charge before cutoff=Highest Amps, Example Evic VTC Mini Ver1 software, 60watts/3.0volts=20amps
2) A decent resistance "Ohm Reader" or Digital Multimeter to read your resistance (Ohm's) and an "Ohm's Law Calculator" on your phone to help with these calculations, just need to fill in the 2 boxes relevant to you, Mech = 4.2 for volts and your resistance (ohms) calculator will do the rest and fill in the other 2 sections, Regulated your wattage setting and lowest mod shutdown voltage on your battery.
3) Basic tools, jewelers screw driver set, flush cutting wire snips, maybe some diagonal cutters, some needle nose pliers, maybe some tweezers, and pair of scissors.
4) Get Kanthal and Nichrome wire from Temco Industrial Power, 90% of Kanthal and Nichrome resellers buy wire from Temco, so cheapest to go to a direct manufacturer and save money

5) Ko Gen Do, Moji Cotton, or Rayon I'd probably look at Lightning Vapes.