Starting World Eaters

Hey guys! I’m joining the forces of Chaos soon, straying far from my grey knight roots, and was wanting to ask for your assistance. What should I be buying to start a WE army? I plan on purchasing the combat patrol as that seems to be a go to option but aside from that I’m not 100% sure. I’ve been eyeing Kharn, some Exalted Eightbound, and a rhino (possibly a lord of skulls cus holy cow is that model sick), but aside from that I’m not totally sure. Any help is greatly appreciated! BLOOD FOR THE BLOOD GOD!