Odd concept, but I think it could work I just need some help as im a bit new to pathfinder. And Im coming here for advice since im going to high level planer campaign in coming up. Ive got a concept but im not sure how to build it since I never made a Lvl10 character for a start of campaign and the DM has told us that its going to go past lvl 20. But in the end I know what I want to achieve, is to be a good strong barbarian that is able to lead a horde basically. But im somewhat lost on the build to do so. So if possible could people suggest to me some good traits, im still undecided if I should take unchained or regular Barbarian. From what I seen is that Unchained, I lose a lot of archetypes. So if anyone could show me a good build or give some advice I appreciate.

The things that I know I need to make this concept is
Orc/Half-Orc Barbarian
Strong with an greataxe, so two handed fighter,
And can lead a horde, my issue with that is, Charisma is not a strong suit, so im confused on how to fix that problem...