I could write a book. I think your first step is getting your
device you want/need. You could ask your vape shop for unflavored nic
juice just to dial things in and know that it isnt your coil/
mod/setup causing the burned taste. Once you are dialed in for the most part (some flavors you will adjust power/heat, but not by much) then i would suggest diy. Dont get into overload, last thing you want is to be overwhelmed but there is a DIY section in the General E liquid forum where not only would it be more appropriate but you will also get more opinions from others who DIY than you would here in this thread.