The best way I have found is to discus what you are going to do on the ground because it will give them time to contemplate what they are going to do and affording them the opportunity to ask any questions on the ground and not in the air which will mean that you can dedicate all your concentration to flying the aeroplane.
Once in the air make sure you do and say all your checks which will fill your pax with confidence. Once you are ready to start tell them what you are going to do, and more importantly where you are looking this will help them orientate themselves which might alleviate the need for a sick bag. Always ask how they are feeling and as soon as/if they feel ill STOP, if your pax has any flying experience let them take control and that will hopefully take their mind of feeling ill.
Most of all pick your day; make sure the WX is fine, there is nothing worse than a bumpy ride before you even start. But more than that relax and enjoy, there is nothing better than introducing someone to aeros.
Enjoy and Fly safe,
Ed's
