A question close to my heart.
For starters, almost all the rules get this wrong. There were no units of Eagle Warriors, or of regular warriors or of totally green youth.
A typical fighting unit would be a Tzontli. This a 400 men that all came from the same calpul or barrio. As you correctly state, this Tzontli would consist of a variety of skill and experienced warriors. I don’t think any firm numbers have ever been determined. A good source to look at is Ross Hassig’s book:
https://www.amazon.ca/Aztec-Warfare-Expansion-Political-Civilization/dp/B00XX62XSK/ref=mp_s_a_1_3?crid=1DAXEPW45MNFB&keywords=ross+hassig&qid=1652111142&sprefix=ross+hassig%2Caps%2C93&sr=8-3(Buy the cheaper soft cover)
Here would be my recommendations on a 400 man unit
About 200-300 green troops and low capture warriors
About 50 Eagle and Jaguar Warriors and other fancy suit wearers
The rest are higher veteran high capture warriors
The add a few Quachiques out front skirmishing
Having said all that, I’m sure your combat units have far less figures than a real Tzontli. So just use what you have. The nice suit wearers and their beautiful banners are at the front, the guys with the nice “flak jacket” chest protectors in the middle and they inarmoured green troops are the rear rankers. Easy. As long as you have a mix of troop types you’ll be good.
Now the priest warriors would be in their Tzontli. Didn’t want to mix with the non religious riff-raff. But everything else would be the same. Best guys start in front and lesser troops to the rear.
Each Calpulli would have a few regular Tzontli but probably only one priest Tzontli, depending on the population of that specific barrio.
Again, Hassig says that an Aztec innovation was rotating the lines after contact with the enemy. So after about 15 minutes of melee, musical signals (drums or horns) would signal that the front rank withdraws and the next rank moves forward. By the time the greenest troops are at the front, the Eagles, Jaguars and suit wearing officers and veterans are at their backs, looking out for them. This way the enemy always is facing fresh or rested troops.
So that’s all interesting but don’t worry about representing that on the table.
Have a smattering of Quachiques or Otomitl in front as skirmishers and have a swarm of macehualtin flunkies with slings and bows to hold the flanks.
Hope that helps. Note: this is for actual battle formations. For the more ritualized Flower Wars probably just Tzontlis were involved. But, as usual, much is speculation.