If you want to use that tank, DO NOT use any of your 100% nic liquid in it. First, it's a sub-ohm tank, so you need a nicotine percentage WAY LOWER than that. I'm assuming, since you have some 0 nic liquid (is it flavored?) that the vendor instructed you to mix it (oh God, how I hope that is the case) BUT, I would stick to premixed liquids for now (personally) and shove that Nicotine base in the freezer (I think it keeps better in dark, glass vats, but I wouldn't worry about that-- for now. Once you've discovered your preferred base VG/PG mix AND your watts (you can CERTAINLY go lower on wattage than the recommended wattage on coils, though it may be difficult initially and you are still sub-ohming, which tends to lend itself to lower clouds. I WOULD start at a low wattage and work my way up, if I were you, I certainly had a hard time quitting with the Cleto as I got nic overload (I was a HEAVY smoker, more like 2--3 ppd) and could only vape it with 6 m.g. liquid. I'd recommend the Nautilus 2 tank, and I was pleasantly surprised by vaping the sub-ohm coil not just the 1.8 coil (it comes with both, so it's nice to be able to experiment) at less airflow and essentially, the same wattage (15 watts) it's just a smoother vape for me.
As far as your 100% nicotine it is typically sent out in either VG or PG from what I've seen the vendors I've checked, so if you can't find it anywhere on the bottle, you can certainly contact the vendor and ask which base it's mixed in.
Also, PLEASE don't try mixing that quite yet! Go to the DIY section, on flavorings, and read up and ask questions, a nic level that high can be very toxic. You're going to need the right protective equipment and possibly some other chemistry items. I have 60 mg. of 100% nic base but I read a little, froze it, and promptly ordered 60% nicotine base, and a bunch of unflavored VG and some flavors. I got a gallon, knowing that I could use that safely for a LONG time, and plan to do more reading *myself* before I start mixing flavors. I'm a klutz and you may do better, it's just that the questions you are asking here make me highly fearful for you to try and add PURE nicotine to anything and accomplishing it safely/successfully. Don't get me wrong, I am sure it will be useful at SOME point, but at this point, it sounds like you are trying to get a stable vape going for yourself, and I would do that first before DIY trying to figure out liquids/taste/etc.
Anna