Welcome Eric!
Plenty of good recipes in the links given.
A favorite of mine, which is also really simple is:
5 % Capella Vanilla Custard V2
5 % Capella French Vanilla V2
Steep for at least 2 weeks, 4 is better.
If you use VG-heavy juice, no sweeteners needed.
Of course you'd have to like vanilla
However, please make sure to do some thourough reasearch on DIY.
It is not without its pitfalls and dangers..