Hey there
@dandoolittle
I've been making my own for a while. I don't have enough posts to post links, but here's the DL.
You'll need these things to get started:
Digital Scale (Trust me mixing by weight is a lot easier!)
VG
PG
Nicotine (Don't get 100% nic...that shit is dangerous. Get the premixed PG/VG stuff)
Flavorings (There are a ton of websites out there that sell these if you want me to link some I can shoot you a PM)
Something to mix in (I bought some beakers from Amazon for a couple of bucks
Something to stir with (Got a chemestry mixing thing from Amazon, but anything will do)
Pipette droppers (To pull your ingredients from their bottles and drop it into your beaker or whatever you use to mix in)
A mixing program. I use one called Juice Calculator (Again I don't have enough posts to post links

)
Basically you plug in what VG/PG and your nic level into the program and then you can put the % of each flavor you want. There are also tons of websites out there with recipes or if you want you can mess around with your own creations. I go on DIY eJuice on Reddit all the time.
Once you plug everything into the program it will show you the weight of each part to put in. Throw your mixing jar/cup/whatever on your scale, weigh out everything, mix and pour into your bottle. You're good to go!
If you have any questions or anything let me know.