Hi sensay, welcome to the light side! To get set up for mixing you'll want a few basic things. Unfortunately you can't get them all in one place. What a raw deal but that's just the deal. Actually, you probably can get most everything you need from one or two places, but there's going to be specific flavors you want that you'll have to go looking for. Here's a list of what I consider the basics:
PG and/or VG nic base, with a high enough nic level that you can cut it at least by half and still get your desired end nic strength. For example if you vape 24mg you could probably get away with 48mg base.0 nic PG and VG. These are cheap, though PG is a bear to find except by mailorder.Flavorings. Common brands are Lorann's, Fairy's Finest, Capella, Perfumer's Apprentice, Flavour Art. I'm beginning to lean back toward Lorran's because they seem to be the most concentrated to me, which can be important if you like a Lot of flavor.Storage and carry bottles. I like to store larger quantities of everything in glass dropper bottles easy to find on eBay. 30 ml bottles would be a decent size to be handy to use but I have some 60 ml bottles for storing mixed liquid. Also 3 ml and 6 ml plastic drip bottles.Pipettes for dripping. One thing that can throw you is that different drippers have different drop sizes. You'll have to adjust your calculator for the number of drops you get per milliliter; that really varies! So using the same kind of disposable pipette can help to standardize mixing. (Disposable pipettes can be rinsed out and used many times.)Latex gloves. Mixing is messy and you don't want to get high-nic base on your skin; it can make you quite sick.A calculator for determining the volume of each component for your mix. Don't use mine, I found a math error that I haven't fixed yet. There's a thread here with a great calculator that also includes a ton of nice recipes and some 'how to' type information.
I think that covers the basics at a high level. Look through other threads here to find suppliers and many good ideas. You may hear some conflicting advice but you'll soon determine what you'll want to try first.
One thing that I'm figuring out that works well for me is to mix your flavoring together in a discrete bottle. Then you can experiment with PG/VG proportions, how much flavoring to add, etc without messing up a whole mix when you get it not-quite-perfect the first few tries. Also, you can mix with 0 nic base to test flavor and vapor properties before you commit your measure of nic base.
Good luck, have fun, ask all your questions and vape on! You found the right place.