Starting in one day events?

I just had my first mini event last month and it was a blast! You're going to have SO much fun! It was both mine and the horse's first event. We did the pre-novice, like you, (max 2 ft.). Considering you're doing one of the lower levels, stamina conditioning isn't as important, but once you get to the next level, start doing some conditioning work for XC. My conditioning program is 3 min walk, 15 min trot, 3 min walk, 3 min canter (bad way), 3 min walk, 3 min canter (good way), 3 min walk, 3 min canter (bad way) walk out. then raise it by 15-30 sec every week or two. Memorize your dressage test, but don't practice it too much on your horse, otherwise he will memorize it too and then he will mess up the test at the show from anticipating the movements at certain points. For jumping, practice at least how wide and high the XC jumps will be, and even higher and wider so you are even more prepared for the jumps. Make a check list for everything you need and go over it twice before you leave! Don't let nerves get to you, just focus on jumping safe! Don't fous on competing against everyone else. Just compete against yourself. Set a goal for yourself and each time you compete, try to do it a little better! You may want to lightly ride him around the grounds if it is possible one you get there to acclimate him to his new environment. He is most likely going to be looky, so just be prepared for it. Hm, I guess that's about it! Good luck, be safe, and just have fun! I'm so excited for you!