When I bring a new shooter to the range, I go over etiquette and safety before we even leave for the range. First time on a range for a new shooter can be a stressful experience (especially an indoor range), so I go over exactly what's going to happen, how to use the double doors, point all firearms downrange ....ect. After that, I stay with them until they are comfortable and I feel they no longer require constant supervision. That way they have a good experience, don't have to have an RO have to correct them, and hopefully enjoy shooting as a sport.
This.
First off, if you're bringing someone to the range who is new, it is safe to assume that YOU know the rules and are competent with handling a firearm safely? Is IT? (NOTE: not making any judgement on YOUR particular abilities. Just stating that there should be at least one adult at the table.)
Secondly, perhaps introducing your visitor to the RO with, "This is his/her first time here." That will open up for the question from the RO, "First time shooting?" if he chooses to ask. If they are competent shooters, you can work that into the intro as well. And, the RO can keep an eye on them until he assesses their gun handling capabilities. No need to put a scarlet "New Shooter!" sign on anyone's back/front. Their actions are YOUR responsibility. YOU know that they are new to shooting. YOU brought them to the range around other people. YOU are responsible for doing everything within your power to ensure everyone's safety. That brings me to a perfect example:
I've seen too many overly-exited, new shooters come to the range who are more interested in showing off their new gun/gizmo than they are supervising the clueless, unsafe visitor whom they are trying to impress. Both me and my son were muzzle-swiped with a live firearm, a finger on the trigger by a woman who just HAD to turn around and see the reaction of all her friends when she actually hit paper. The one who brought this new-to-shooting person, was comfortably sitting on the bench, way behind the shooter. I was so mad, I swore that if I got shot, I was going to at LEAST work my way over there and beat them both before I bled out!
Been to ranges where the guy who brought me said, "Don't point your gun at me and I won't point mine at YOU!" Fair enough. He never needed to by the way.
It doesn't take a village to keep a range safe. It takes personal responsibility. (The world need MORE of that!)
I know, I'm sounding a lot like a grumpy, old man. But I'm not getting any younger ya know!