Your first skein is BEAUTIFUL!
As for the multiple colors of Corriedale, you can do whatever you want with them. You can spin a short length of red, then a length of blue, then a length of green and get a variegated yarn. You can spin each color separately and ply two of them together for a barberpole effect. You can spin a long length of each and splice them together for Noro-like stripes. You can hold a small chunk of one color and a small chunk of another in your hand and spin them together to get a softer color. At that price, you can have fun and experiment. That's the beauty of spinning: you can make the yarn YOU want. I haven't bought from that eBay source, but the roving they are selling looks okay for spinning (the reason they mention felting is that the quantities are small). But if you're unsure, just email them before you buy. They sound like a nice group.