The equipment you need is driven by what you're doing. Any basic "headshot" (for an interview, for instance) can be lit with a 650K (with Chimera), a 150 or 300 on a C-stand (don't forget the sandbag!) for a backlight, plus at least one more unit to light the background element(s). You can get away with 2 650s and 2 300s for simple situations. The smaller the room though, the more flagging you'll have to do to control the light, which means a small flag kit, extra C-stands, extra sand, plus a few stingers (extension cords), cube taps, and a dimmer or two.
Again, depending upon the situation, most of the time you'll be able to light close-ups of your talent with just a couple of fairly modest units. The wider the shot becomes though, the more units and/or firepower you'll need, if nothing else than to just get a base level of illumination up to exposure level. Then of course you're dealing with power issues. Relatively recently, I had to light an 8 person "panel" discussion for four cameras with one on a dolly. I managed to get away with a bank of key lights using 2 1K Moles and 2 650k Arris all with Chimeras. For backlight, I hung 4 Arri 300k's off a backdrop stand. The "moody" background elements were lit with an assortment of 650s and 300s. I was shooting WFO but it was acceptable and more importantly, it looked good. The client was happy.
So the basic kit doesn't have to be huge, but be prepared to subrent extras when necessary. Nothing beats scouting and figuring it all beforehand.
Good luck!
Brian Dzyak
Videographer/Writer
IATSE Local 600
Encino, CA
www.whatireallywanttodo.com