Have your first camping trip be close to home, especially if you have kids. My sister’s family just went camping nearby for the first time last week in 90 degree weather with severe thunderstorms in the forecast. They were able to sleep there one night and then just returned for day trips on the remaining days of their reservation.
Keep your food stored in your car or in a bear box. Apparently my sisters camping neighbor decided to hang their food in their tent (they probably heard something about hanging your food from a tree and forgot the tree part), and raccoons tore the tent open to get inside of it.
Acquaint yourselves with the rules, especially quiet hours. Time goes by quickly when you are having a good time around the fire, and before you know it you could be well past quiet hours. I was camping at Zion and my neighbors were up well past the quiet hours. One of the members of the group mentioned that they should be quieter, someone else said that they were talking at a normal volume so others shouldn’t be able to hear them. This was not true
Respect your campsite! Hammocks are huge right now, and I see a lot of them hung up on trees that are not thick enough. Do not break branches off of trees for your fire or for hot dog/marshmallow sticks. This should go without saying, but clean up your site and don’t just leave your garbage in the fire pit for the next person to deal with.
Anticipate bugs. Buy a screen house if you have the budget for it, I regularly set mine up in the backyard so it gets lots of use.
Borrow as much camping gear as possible (at a social distance) before you invest in your own. You not only get to save money, but you will get an idea for it what gear you like or dislike. You have to be willing to replace it if you break it though.