There really isn't much education to it.
Start off with a simple flavor or combination of 2 flavors. Mix them with Nic and the ratio of PG and VG that you like (I generally use 60% PG to 40% VG as it seems to give me the best flavor and consistency that I like.
There is a calculator called
eJuice Me Up that is free and works all the numbers out for you based on the percentages that you supply.
I buy 100mg aka 10% nic now because it gives me more flexibility on the flavoring which are PG based. I was having some issues with mixes that I tried with several flavors when using a 48mg or 4.8% nic because it was putting my added PG requirement in the negative based on the PG already in the flavorings.
I get my nic, PG,, VG and flavors from
wizardlabs.us when I buy them all together, but just did a flavoring only buy and got all my flavorings direct from the manufacturer The Flavor Apprentice which brought the prices down some based on the volume that I bought for my favorite ones.
I use blunt tipped filling syringes for measuring out everything and mix in a pyrex flask and then transfer the mix into plastic or glass bottles.
It was intimidating at first and can be a pain in the ass to work out a mix, but tonight whipped up 60mls of my ADV in about 15 minutes pretty much covering the cost of all the flavorings that I just bought but barely using any of them.
The group on the DIY section of the forum are all very helpful and several post up recipes although I have not tried any beyond some advice that somebody gave me on a specific blend that I was working on but still not quite happy with so I have not shared it yet.