Evlutte

I'm brand new to this mod and having difficulty understanding the mining/resource processing aspect. I understand that it's desirable to mine some resources as they're very expensive otherwise. Is there a tab;e somewhere that gives the resource costs? Is there a way to "sell" resources without recovering the associated vessel? Does it work well to mine resources, sell them, then rebuy as needed or is there a better way to handle things? Obviously orbital/interplanetary refueling is it's own beast, but I at least get the idea of how that should work. Thanks for your help.