My experience has been, if you can afford just one light, to shoot mostly interviews, and you’er low on experience, a Lowel Rifa is a very good choice. Totally idiot-proof. It is a big softlight that folds up like an umbrella, it’s faster and cheaper than a Chimera and speed ring. It gives a great, wrap-around light if you put it about 45 degrees of to the favored side of the face, and all but the smalest versions will have enough power to override the effects of other color back or background lights. If you bring a sheet of white foam core or cardboard covered in foil, on it’s own stand, you can use that on the other side for a bounce fill effect that’s just the right amount. You’ll geta vermeer-like light quality with this setup. If you don;t buy the eggcrate front for it, you should be able to buy 2 of the small version or 1 of the intermediate size Rifas.
If you had less money, I would say rent a real 3 or 4-light kit. Lowel is my favorite. I would rent and eventually buy a 4-light kit comprising 2 Lowel Omni’s, 1 Lowel Tota, 1 Prolight or mini-pro, extra stands, a totabrella and 4 tota-gel frames, a roll of black cinefoil, sheets of toughspun or tough frost, sheets of foamcore, gaffer tape, wooden clothespins.
I have had good luck making softboxes to put in front of ordinary open-faced 1K halogen video lights, out of foam core, gaffer tape and tough spun. if you build these right, they don’t even get warm, and cost twenty bucks or less. Not very portable or sturdy, though, more for permanent studio use.