You might also check our library above -- there are checklists to cover a lot of things, including pre-trip preparation, which includes checking whether a lot of things are on board.
Keep in mind that any suggestions for things to take may include things you don't need, as everyone's needs are different, but at the least you'll get some ideas, and get a feel for what others think they need. For instance, if a tool (torque wrench, maybe) is suggested but you don't even know what that is, or at least don't know why you'd need one, perhaps it would be something for you to skip. After all, different people have different skills, hobbies and needs.
One thing you'll definitely want is a notepad, or other means, with which to take notes on things you forgot or didn't think of, things you'll want to do differently, etc.