Goats and Chickens should be kept separated, as you likely already know. So that, as much as possible, they can be fed seperately. Chicken feed much more dangerous to goats than goat feed is to chickens. Chickens may peck at goat mineral a few times as they explore their world, then will promptly ignore it. Still, keep it out of reach of your hatchlings and adolescents.
In Ravenel, if you are getting a small number of chickens, or the bag isn't fresh (made in the last month or so), get Purina's Flock Raiser Crumbles (5# bag) if you don't need medicated. [Assuming you've had no chickens before, and have "virgin ground", non-medicated is likely fine. Coccidia is everywhere humans have been, yes, but reflexively medicating isn't necessary unless you know (or strongly suspect) you've had a coccidia outbreak recently on your grounds. That said, it generally doesn't hurt - personal choice, informed by risk tolerance. If they fdon't have the small flockraiser (and you are buying small), get either the Purina Start/Grow (medicated or not, your call) or the Dumor Starter (medicated or not, your choice), in that order of preference.
If you are going non-Medicated, are getting a lot of chicks, and the bag is fresh, get the Purina Flock Raiser Crumbles 50# bag.
If the store employee tells you that you should be getting starter or starter/grower instead of flock raiser, tell him/her to compare the nutritional labels and explain why to you. They will learn something useful for the next time they try to "help" a customer out.
[My flock is in my Singnature, below]