Hi and welcome. You came to the right place for tons of good info and advice. Just take your time and read, read, and then read some more. As for advice, you'll just need to pick what seems to fit you the best.
Most of us
buy unflavored nic and then dilute it down and add flavorings. There's several great vendors and I'd recommend looking through several. I like Bull City and the Inawera and Flavour Art flavoring lines.
Some popular vendors, google the name for a link. Vapers Tek, Bull City, Wizard Labs, RTS, One Stop Diy,
vaping Zone, Ecigexpress, just to name a few.
Here's some recent post's that might give you some ideas.
http://www.e-cigarette-forum.com/forum/diy-e-liquid/648508-finally-making-jump-into-diy.html
Best of luck to you.