Trying To Book A Cruise Holiday...HELP!?

As you are under 18 you won't be able to book it anyway, your mother will have to go with you. Thomas Cook are probably the best, but look up the cruise lines and check out the cruises and prices. Alternatively, get brochures from a couple of travel agents, they cater for different tastes, and have alook through them with your mother. One thing to remember is that the earlier you book, the better the price you can get as an early bird.