I am going to sift through all the information given to me so far and see what I wanna do and when I wanna do it. Time is the problem for me right now because currently I don't have any money to invest into building up a small selection of products to get this started. So this is just a thing of the future, but I know I will most definitely do it because I want to save money, plus it sounds interesting and like a hobby as well.
It can be an
EXTRAORDINARILY fulfilling hobby.. And as someone that is disabled, trust me that hobbies are an absolute MUST!
I would also strongly recommend the use of a recipe calculator that will display both grams and volume. For a beginner, something like EjuiceMeUp might be easier to handle. But if you continue doing DIY, it will very quickly become a supreme PITA. You should then go to a more advanced calculator (or even just start with one), like the free one in my sig... It even has a facility where you can keep adjusting an already mixed eliquid, if you use bottles that have [known] ML markings (or make them yourself).
Also, if you do decide to stick with it, and find you may prefer to mix by volume - you may want to invest slowly into glass syringes and all-SS dispensing tips (via Ebay). You won't have to tape over the markings, and I find the plastic ones will invariably either start binding or getting too loose. Not to mention that there are many flavors that will end up melting/destroying the plastic ones. And I didn't want to get into a syringe habit as well.

Just start building up a few slowly, since they
are more expensive. They're surprisingly strong though, and you won't need many at all. The glass syringes in my sig were pointed to from someone here on ECF as being the best, but I forget exactly why they said these were better (something to do with markings, maybe??).
I also save by now buying most of my flavors in 1/4/16oz sizes and transferring to amber glass bottles with phenolic polycone caps for long-term storage. And that is also why I kind of HAVE to mix by volume with syringes, on top of mixing in a way that uses maybe only one 1ml/2ml/5ml glass syringe for all flavors, and another 10ml/30ml glass syringe for pg/vg --- going from lighter to stronger flavors, and just wiping the tip between. But, I digress.. That is for if you start following the rabbit holes.
But as mentioned in the thread, unless you plan to build in and enforce consistency somehow, I would avoid measuring by drops altogether. They're entirely too inconsistent, on top of the likelihood of miscounting. I've actually measured some bottles to be 20 drops to a ML, and another to be 80 drops to a ML. That's quite a range, to say the least.