Hey, sorry, in the UK, so was nearly 2 o'clock in the morning!
Basically, i work at a big tennis centre, so we distribute leaflets and what have you in the build up to school holidays, and use the website and word of mouth for the other target groups. Been going for a long time now, so have built up a large awareness in the area. When i do individuals, they are organised beforehand, where they usually pay. Most things are sorted out before hand but i give them my mobile and email, just in case. The only major problem i usually have is over subscription to course, obviously, when you've got more players than court space, there are issues!