Bon Voyage!!

I need help! (I know, I ask for help... A LOT!) For Brent and mine's 10 year anniversary we are wanting to go on a cruise. Our anniversary is in October and we won't be going until next March. But I want to get a start on planning it so I was wondering where do I start? I know a lot of you have already been on one so I need you advice on where, who with, what you wish you knew, anything!
We are so excited to go and we are going with my sister, Beth and her husband, Sam and our best friends Kia and Christina. We are all celebrating our 10th anniversary this year so we thought: Let's all go!!!
P.S. We are partial to a Disney Cruise but I feel guilty not taking kids with us.