There isn't enough infrastructure to work stone or metal, and society doesn't think of crystal as any different from stone. Leatherworking has just started, hence why you can get armour, but other than that, hasn't advanced enough to be used outside of tent walls. You could go into Leatherworking with a craft skill and then backstory some stuff, but it would still have to be very basic gear, something that an Orc with low intelligence could figure out there was a need for. Even if you maxed Int, you'd still end up with only 16, which isn't a shining example of intelligence, especially without education.
Use Negotiator from 3.5e; I'd have to delve into Pathfinder to find a parallel, but the feat itself is fairly low-key anyway, so just adopting it straight across won't hurt anything.
Saddles are too advanced for society; you're riding bareback. As for mounts... Great Wolves (3 HD Large Wolves. Large reduces Dex to 13, raises Str to 15, reduces to hit by 1, reduces AC by 1. Extra Feat... I don't know, anyone know a proper feat for carrying capacity? Otherwise, Dodge.) If you're looking for other mounts, then Stags and other freeroaming forest animals of Large size would be fine.
Stick with 1 trait.
As for Favored bonuses, use Orc, Half-Orc or the other subrace you're halved with, as desired.
4maskwolf, I'm gunning for up to 8. We have 2 for sure, 2-3 maybes, and you.