Hi Cynthia,
1st, keep an eye on the classies. Reo Mini's pop up there fairly often. There is a black/black one there right now that is in almost perfect shape (so says the seller). I would buy 3-4 quality atties from Avid Vaper, and at least a 5 pack of the super short smoktech 1.7 ohm cartos. You can get these at Madvapes, CCV, COV and probably a few other vendors. I would also recommend having at least 3 batteries and a good battery charger on hand. I only trust AW IMR batteries for mods, but others are available. The trustfire chargers seem to be the best quality for the value, but PILA chargers are the best, or at least that's what I have heard. You will need a few drip tips, and I would pick these up from whatever vendor you buy other supplies from. There are many options, but the delrin ones are cheap, work well, and don't get too hot.
All that's left at that point is the Juice. There are too many good vendors to list, and I recommend trying several. Many vendors have small sample sizes, or you can gamble as I do and just buy 10ml bottles and larger. IMO the best prices are to be had at ECBlend and BlueMist Vaping, but if you keep an eye on the Deals and Steals thread, there are many sales and good values to be had. This is how I have been choosing juice vendors for the last month or so. Whoever has the best sales get's my business that week. It also allows me to try new vendors often.
All of this info is my opinion only and is very subjective. There are many other opinions out there, and you owe it to yourself to do the research and form your own opinions for yourself.
I hope this helps, good luck!
-AJ