Wanting to get started with old world

I want to start old world but I’m not exactly sure where to start, I’m trying to decided between 3 armies. Dwarven mountain holds, orcs & goblins, and Beastmen (Can’t really find rules for them), but I’m not sure where to start. I can’t seem to find any sources to help out either.

Where’s a good places to start looking and good starter tips?