The c700 is a good enlarger. If you hadn't gotten one already, there was a nice chromega-B enlarger on the classifieds here (no affiliation) which is like I have and is very good for 6x6cm or smaller stuff. It is a very versatile and easy to use quality enlarger. If your enlarger is missing the lens, there is a possibility it's missing the lensboard as well, which is the metal plate that holds the lens to the bottom of the bellows. If you browse ebay for Omega lensboard, you will see examples. It should have a hole in the middle of the appropriate diameter for the lens rear diameter you will be putting in it.
Find an El Nikkor, Schneider Componon-s, or rodenstock lens for the enlarger here or ebay. I use a componon-s 80mm for both 35mm and 6x6cm negatives, though most people use a 50mm only for 35mm negatives.
Hopefully you have a good dial (or digital) thermometer for film developing as the developers work differently according to temperature.
I still read craigslist with interest at all the killer darkroom equipment deals. I don't need any of it, as I have a complete setup already. It's just an exciting time for someone getting into film, especially B&W.
I found plastic reels (paterson style) easier to load and deal with than stainless, but it's a personal preference.
A gralab timer can function as both an enlarger timer, and a film developing timer (if you turn off the enlarger with it's own switch).
In addition to Chris's good writeup, you might get some hypo clearing chemical to reduce the amount of washing needed. A bath in that with a couple of washes before and after will save a huge amount of washing time.
I put my chemical in wide mouth plastic juice bottles. Some chemical are light sensitive, which is why brown bottles are often sold for darkrooms, but my chemicals stay in the darkroom, so it's usually dark there.