Oh well, that's good.
I would start out small and basic with some basic, single or double flavors at first.
You'll need some nicotine base. Starting out you may want to order very close to the mg. strength you currently
vape until you're a little more sure about what your doing. The base can either be PG based or VG based although some suppliers with sell you a combination.
Then you will need pharmaceutical grade PG and VG and flavorings. Most DIY suppliers will tell you what flavor percentage to use. Pick up some empty bottles and something to measure, syringes, cylinder, etc.
There are several websites that have DIY calculators. All this info can be found in DIY.
The best advice I can give with DIY- If you have a question along the way, ask!