I might need to start DIY'ing due to my high consumption. I'm a total noob, what do I need to buy and from where to start cooking custard?
Pick up some VG and PG, as well as some nic base (from here is cheap http://www.cig-eliquid.co.uk/).
From there all you need is capella vanilla custard, dulce de leche, and some perfumers apprentice french vanilla (I didn't use that, but it seems to be recommended. All available from http://www.leisureliquids.com/capella.html).
After that, I suggest a syringe with a reasonably wide gauge needle to measure your flavourings, a 10ml measuring cylinder to make mixing up the base easier, and something to store your liquid in (any left over eliquid bottles will be fine if you rinse them out.
Then you just mix it up to the recipe.