The usual way of many profs is to put some orange gel (Tom mentioned suitable ones) in one of the lights - the one which gives mosly light for the face. Main light and/or fill lights may be white, so (maybe white) clothing does not get off-color light.(posted 8752 days ago)A good trick is also to use 'hot' flood lights for face fill, if the main lights sre strobes. 3200K photofloods alone give a quite warm tone with daylight film, but used just as fill they can give that charming warm skin tone.....
Sakari