If you have an owners manual it will give service intervals with the relevant parts to be replaced and when getting a quote the price in a main dealer would include these usually.ie spark plugs replaced every 18,000 mls so difference between 9,000 and 18,000 would be plugs etc.
After that you'd have to wait to see what the mechanics say regards brakes tyres etc.
You can ask the question: How much for an 18,000 mile service on my *****?, then say how much for front brake pads if I require them?