Don't cook too many different things - we find it easier to cook plain meats and then provide various dips and salads.
Put some sprigs of Rosemary onto the coals just before you start cooking - fresh sprigs smoke a bit but the smell is divine.
When cooking things like burgers or fish, don't put them directly onto the grill. Use a baking tray (preheat first) then if they crumble a bit nothing falls into the flames.