Don't forget some pipettes. You'll need nicotine also unless you just plan to doctor up the eliquid you already have.
I like ecigexpress for flavorings because they carry just about every manufacturer (Loranns, TPA (called Signature Series), FA, FlavorWest).
http://www.ecigexpre.../flavoring-c-16
For nic, I usually get mine from myfreedonsmokes (use "20off" for 20% discount - not sure when that expires, but they just about always have a code):
http://www.myfreedom...juice-e-liquid/
I would also recommend reading Kitsune's DIY basics: