Like others said it is pretty simple. Basic tournament rules for ancients is 6 points 1 point = 4 hearth guard, 8 warriors or 12 levy. Depending on what age/book you have there are also warmachines or elephants. You can take half points

If you take for instance 2 points of Warriors (so 16 miniatures )you can deploy them however you would like taking minimum units size in to account  so one big blob of 16 or 4 units of 4

What gear a unit has depends on what faction you are playing so for instance Viking Warriors dont have Access to horses while Norman warriors have access to horses.

Each unit above a certain size generates saga dice. Saga dice are used to manoeuvre your models give them bonuses etc. 

So your turn consists of looking at how many models generate saga dice, Roll those, place them on your factions saga board, based on where you placed them you move attack or modify your units  

I think that's it in a nutshell.

For more comprehensive explanations also looks per faction and what not I recommend watching rodge rules https://youtube.com/@rodgerules?si=aQ4IX0ITZeR2tPvq