Maybe I can get you started.
DIY :
Ingredients - you need four basic ingredients
1) Vegetable glycerine (VG)
2) Propylene glycol (PG)
3) Flavourings (concentrated flavours)
4) Nicotine (only if you want to add this)
1, 2 and 4 are referred to as base ingredients.
The ingredients could be purchased from vendors listed (on the main page) like Vapour Valley, Blck Vapour, The Flavour Mill, Clyrolinx but to mention a few. VG can also be purchased at your local chemist but I find it easier to purchase all my base ingredients from one company (Clyrolinx being the cheapest atm) and my flavourings from another (I use Vapour Valley because they in my area).
Recipes
There a thousands available on the net but I would advise you to look at the recipes on this forum simply because they are good to excellent and have been made from locally available flavourings. @Andre has made it very convenient by creating taste categories for a variety of recipes like tobacco, beverages, deserts and so on.
You will need a calculator to help you with the volumes needed to make a 10,30 or 50ml bottle of juice. You will have to do this because most recipes provide you with percentages that you can now type into the calculator with other information like the ratio of PG/VG and then amount of nicotine you want to use but this will all become clearer once you see the setup of the calculator. I use a simple one called "Ejuice me up" which can be downloaded for free here : http://ejuice.breaktru.com/
The PG/VG ratio's work as follows :
PG is more fluid (colourless and tasteless) but provides the throat hit experience. It is a excellent solvent for many organic compounds and is completely water-soluble and hence why it is also used in ejuice.
VG is thicker and provides more clouds (vapour) and has a sweetness to it but nothing bacteria will feed on.
When you use a setup with a RDA (dripper) then most of the times a mix of 70/30 (vg/pg) is used.
When you use a setup with RTA or RDTA where juice flow is controlled by smaller opening then a 60/40 or 50/50 mix is often used since the fluidity of the ejuice is more and can more easily reach the wick (cotton).
Materials for mixing
You could use a variety of injections with a blunt needlepoint to measure your volumes but this is time consuming.
I would strongly suggest getting a digital scale (accurate to two decimals after the comma) since this will provide you with way less stress than the injection approach. I just pop a empty bottle onto the scale, zero it and then add all my ingredients one by one BUT always zeroing between them.
A glass beaker (for larger volumes of 100 - 500ml) or empty bottles (20-50ml) is also something you would need.
Always keep some toilet paper handy since messing is inevitable.
