I recommend purchasing a 500w work light with a stand. Best investment I ever made. $20, and you can really do so much with it. Also, I'd recommend a reflector kit of some kind, because its so much cheaper to reflect/control light that's already there than buy a light specifically for the task (and not bad at all). You can do SO much with a simple reflector kit (i.e. gold, silver, diffusion, white).
As for what to look for... In terms of very high quality, some are very expensive. I'm talking about: dedolight, arri, mole-richardson.
Less expensive but still (in my opinion) very good: (some) lowel lights, smtih-victor, worklights.
I have become a huge advocate of renting, but that was after I experimented with work lights that I owned and other various practicals. I think that experience is so incredibly key. Learning to light by a book is like trying to learn an instrument by reading all about it. The technical knowledge is only the beginning. Not saying you shouldn't read! But I think reading should supplement experience rather than the other way around.
Just realize all the components you will probobly want/need in a given kit, or even if you buy one light.
-bulb (don't touch the bulbs or else they're liable to explode)
-stand (these are suprisingly expensive things.)
-barndoors (in my opinion if you want to go above the worklight, an absolute necessity. you can always take the bardoors off, but you can't put them on if you don't have them. a great way to control light)
-cables (some lights require you to be separate cables
-gel frames/gels (if you so desire)
-CASE! (to protect your investment, I cite this as a necessity, although some may disagree. just make sure it doesn't cost as much as the light)
just some thoughts.