I DIY .... only with single flavors. I have a cotton candy mix that is my all day vape and has been for years. However, I have a friend who wants to start DIY and he is interested in complex flavors. I'm wondering if anyone has an opinion on the best flavoring starter pack that he could buy that would have enough flavors in it to where he could begin to experiment with the complex flavors that he desires. Thank you in advance - David