Before my son started wrestling, I had never been inside a wrestling room. The smell alone was a full sensory experience I was not prepared for. I knew nothing about the sport, knew nobody who did, and was sitting in bleachers watching a weigh-in wondering what I had signed up for.
Three years later, some of my closest friends are the parents I met at tournaments. Specifically the moms, who found each other in the stands and started the only meaningful conversation happening in a gymnasium at 6:45am on a Saturday.
The MMA and combat sports parent community is real and it is more welcoming than you would expect. At the youth level especially, the other parents have been through the learning curve you are on. They know which ref is lenient and which one is strict. They know which tournaments have good food near the venue and which ones require packing your own. They have been through the first loss and the first win and the first injury scare.
Online communities exist for this too. Specific subreddits and Facebook groups for wrestling parents, for BJJ families, for parents of young MMA fighters. The advice is generally practical and the community is supportive in a way that a general parenting forum is not.
If you are new: introduce yourself at the next tournament. Sit near the parents who are watching closely and have been there before. Ask one question. You will not regret it.