THE BASIC PRINCIPLES OF BUY A PVP CRYSTAL

I purchased 50 grams of apvp and twenty g of mdvp, which one I get started with?, I used to vape crystal meth on foil and i love it, but i dont have an access to it now, so i was wanting to know if apvp is close to crystal meth when vaped on foil? and how much i start with, being aware of that i don’t Use a scale?Feelings of impending doom - This