Hi Sarpal,
Welcome to the Egypt forum!
Not a dumb question by any means. My personal advice to you, after some experience is to go and see a company in Luxor, called Jolleys. They can be found just to the right of the Winter Palace Hotel as you look at it from the river. There are several other companies in Luxor, who, according to others with experience on this forum, are just as good. I have only ever used Jolleys and never ever had any cause for complaint. Choose exactly where and what you wish to see and go haggle! You can negotiate, especially if you have several people wanting to do several trips.
If you use your hotel reception, of course, they will be adding their charge to the eventual price and although I have nothing but praise for Kuoni, having used them for holidays several times, they too will be adding a substancial "commission" to the price. If you have time, look through some of the posts on this forum and you will find Jolleys mentioned a lot as being very reliable. Above all, do not be afraid to tell them EXACTLY what you want and i'm sure you will not be disappointed!