This is a reply I shared with someone else, hopefully it helps you.
First, you can find show information by going to
https://www.arba.net/showsSearch.php#showsearch
You can search by date and location to find something near-ish you. There is only 1 show within a thirty minute drive of me, the rest are 2+ hours. Depending on where you live, you may have nearby shows or you may have to drive to get there.
Sometimes the show catalog is available online, sometimes you need to call or email the show secretary (that info should be given in the link above when you search) to have one sent to you. The catalog will tell you the date, time, and location of the show. It also has information about show rules, vendors who will be there, judges, and more.
Most show people are very friendly and willing to help you out and you may find it easier to get to a show and learn as you go. If you're unfamiliar with what the Standard calls for in your breeds, ask your fellow exhibitors. Like I said, most people are willing to help newbies out. At your first show, I suggest entering just 1-2 rabbits of one breed so you can get the feel for how shows run without the pressure of trying to get several rabbits to the table at the right time. In the past, I had two different breeds and they were being shown at the same time on opposite ends of the showroom.
Once you decide which rabbits to show, be sure they each have an individual tattoo in the left ear. Submit your entry to the show secretary (usually by email). If you aren't sure what all to include, ask. Usually they need your name, email or phone #, address plus the ear #, breed, sex, and class of each rabbit.
Then, gather your supplies. Some basic supplies you'll need is a leak-proof carrier for each rabbit, water/food bowls for each carrier (often smaller than what you have at home since there will be limited space), a folding chair for yourself, and basic grooming tools (nail clippers, brush, etc). If you are planning to sell rabbits, make sure you take the pedigrees for those rabbits.
Arrive at least 20 minutes early on the morning of the show. You will need to find the check in table and pay for your entry fee. After that, find a clear spot and set up your carriers and chairs. You'll wait for your breed to be called to a certain table. There, the judge will evaluate each rabbit and compare it to the breed standard.
That is the very basics to get you started. Once again, most people are very friendly and can help you out. The first show I attended I entered a rabbit. It's the best way to learn, I think. If you have any more questions, please feel free to ask. A lot of the websites I learned the show process from have disappeared and I'm not sure of another good resource to direct you to.