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Welcome!

Here are two big pieces of advice I wished I'd gotten/learned earlier in my process:
1. Applied to both diet/nutrition and exercise; the program/system/methods that work best are the ones that work best for YOU. It's too common to see posts centered around the sentiment of "I did X and the result was Y. Ergo, X is the best/worst thing on the planet", often where "X" is a specific way of eating, named diet, exercise routine, or diet fad. Figure out what sort of style/framework fits your lifestyle within the context of consistently creating a caloric deficit.
2. Don't count on motivation and/or "staying motivated". Sure, motivation is great and we can all use it to our advantage... when it's there. Everyone has down/off days when you're just "not feelin' it" (whatever it may be). Think about your pitfalls and figure out ways to mitigate them; make the right choice an easy one to make consistently. This looks different for everyone and may entail removing barriers to the preferred choices or creating barriers to avoid the negative ones. Some of the things that have worked for me to foster more structured discipline in my life:
- Don't carry change/small bills. Harder to hit up the vending machine in the breakroom.
- Never grocery shop hungry or tired.
- Take an extra few minutes before bed to lay out workout clothes, pre-workout. Helps drag myself out of bed at 5am to workout.
- pre-plan/log as much food as possible in advance. Eliminates the "I had X for lunch and only have 200 calories left for dinner!" situations
- I don't leave my office for lunch unless I absolutely have to. If I drive by a Taco Bell I will stop and eat way too much.

Good Luck, have fun on the cruise.