I always end up saying too much, but I think you only get one chance to say it sometimes, so better too much than too little. What helps enormously is to be clever about how you use the OHP. Anything I put on the OHP has got to be simple and easy to read, so that it helps the listeners. Diagrams, especially, have to be large enough for the audience to see.
Good morning. I'm calling about your advertisement in Stationery News looking for overseas distributors. Could you send me some more details about this, as I'm very interested in this opportunity. My name is Sally Brown, and the address is ...