When we first decided to plunge into cruising I found a variety of helpful resources to dig & study.
The first was the Unofficial Guide to the Disney Cruise Line (the edition I got was 2019, but I also purchased the 2020, 2023, and 2024 versions). It is much smaller than the WDW UG so it was easy enough to bring along on my cruise and have a reference for things when I couldn’t easily figure it out on my DCL app or the stateroom TV.
Then through the UG I found https://disneycruiselineblog.com/ and Disney Cruise Tips - MouseSavers.com which are both pages I keep bookmarked and open daily for checking through all things cruising.
Then for stateroom info I did find DIS DCL Staterooms breakdown to be easy to follow and more visual than the other two. Plus it was the one place I could see the most reviews.
Cruise Critic is going to be another forum that has a TON of info on cruising including DCL, but I’ve never gotten their website to load nicely (or quickly) on my browser so it’s more frustrating for me to find things there than the other sources.
As for how to pick your first one. I followed the UG’s advice to pick a Caribbean sailing for first one and go for shorter than 7 days, and at that time they specifically recommended the Dream to get the length of sailing with the awesome adult areas as well as the more up to date kids club areas and more activities to do (mini golf, an interactive game ship-wide using the artwork called Midship Detective Agency, and the water coaster Aquaduck).
By the time we got to sailing, it was 4 years after I’d started researching it (thanks Covid) so the Dream was no longer in Port Canaveral or doing just the 3 and 4 night sailings which were all reasons why the UG had recommended them for first time cruisers, but we did still decide to stick with the Dream and ended up doing 5 nights to Cozumel & Castaway Cay (out of Miami).
I loved the itinerary and both ports were great but I loved the ship the most and by the end I was wishing we had booked even longer. But we were also traveling with extended family who were hit hard with motion sickness the first and last days and while they were prepared to maybe get hit by motion sickness, they didn’t think it would be so bad for them and 3 of their family of 4 were ready to be off at days because they were pretty miserable.
I would highly recommend looking for a 4 or 5 night sailing if you’re wanting to get any time off of the ship in a port. But a 3 night sailing is doable if you’re planning to make the focus of the trip the ship and maybe do a partial beach day when the ship goes to either Castaway Cay of Lookout Cay at Lighthouse Pt (Disney’s private islands).
But it really is a personal preference! Also, there’s a very a very big variety in opinion of the better ships in DCL so you really need to figure out what suits your vacation preferences best. I love the Dream the best, but a lot of that is because of how much I love the atrium & the Royal Palace restaurant just off it and the fact that it was my first cruise. I love the Wish second best because I felt the theme of the atrium and the chandelier with it’s light-up show each night at 10pm, 11pm & midnight was stunning! But we also had 10 days on the Wish all in a row (by booking shorter cruises together) & I think that played a huge part in why I loved the ship so much, it was home by the time we had to get off.
But there isn’t a bad ship in any of them and I’d sail all of them at any day. My qualms with any of them are all minor inconveniences and I love just about everything else my quips & qualms aside.