I'm sure people would like to help you and there is tons of info on these boards , but may-be if you could ask a more specific question!?
If you've never cruised before what exactly do you think you would enjoy, do you like shopping, snorkling, eating(who doesn't) are you interested in many days at sea , or do you prefer alot of port days?
Will you be own your own, with your family, with kids?
Deals, well you sure have to do your homework, many use travel agents, and in the case of Princess, thats a good way to go since they will not give you a better deal than an agent. Many here also use online booking, read the boards and I'm sure you'll get lots of good info, we have some VERY experienced cruisers on here( I'm not one of them ) .
I have cruised Princess before and loved it, and plan on going on the Golden in 'April so I know you've already made a good choice( Princess) .