I'm looking through the aide bar and reading all about it and have found some spots to buy nicotene in canada.

However, I'm not sure how much of each to start out with. My eyes are always bigger than my belly so to speak. So if I were to buy 500ML of VG how much nicotene base and flavoring should I get for that much VG ... I know I don't or figure I shouldn't need equal parts but would say 60ml of 50 mg/ml nicotene last through 500ml of VG? And the same thing for flovoring (I just like straight up fruit flovors mostly) so if I bought say 120ml of tangerine flavoring how far would that go? And do these have a good shelf life when stored properly? Sorry if these are dumb questions and thank you for any help!