Im using lizards lab so the nicotine will already be dissolved in pg.
I didn't know there's a Lizard's Lab. Did you mean Wizard Labs in FL? Doesn't really matter though, I'm just curious.
As suggested above, I'd get your Nic base at 24mg at a minimum, so it'll be easier to end up with your 12mg final Nic. You'll also want to decide which base (100% PG or 100% VG or combination of both) that you'll order it in.
Before you put out a bunch of money on scales, or large quantities of the PG, VG, and Nic bases...I'd first get smaller quantities of the liquids and some syringes first. Wizard Labs sells 120mL of all of those things, and several sizes of syringes and blunt needle tips. I'd get maybe a couple of the 1mL, 3mL, and 5mL syringes and several of the 14ga blunt needle tips, so you won't have problems getting the VG drawn up into the syringe. That's about
the least expensive way you can find out if DIY may work for you.
Work with those amounts of your PG, VG, and Nic Base to see if you can make a flavorless eliquid you enjoy. If you do, and you're sure you want to keep DIY...then order larger quantities of the liquids when you need more. It'll save you money in the longrun!
You can also decide
then, if you're going to continue with DIY...if buying some scales will be a wise investment for you, or if you want to stick with measuring by volume using syringes.
Also, if you decide to try some flavorings as well...
find some recipes first that you want to make, and
then order the flavorings needed for those recipes. Don't just pick out a bunch of flavorings that you think "sound" good. Recipes contain the various "types" of flavorings needed to make the resulting eliquid taste good. However, ordering a bunch of flavorings that simply "sound good to you"...most likely
won't include all the types you'll need to make a good eliquid.