So 0% opacity will be even more transparent than glass, while 100% would be a solid object?

I really don't know what to do with my map. The valley area next to the coast seem very akward to me, and the mountain range is so small and pathetic for my purposes.

It's kinda sad. I made my planet only 14,000 miles in circumference to make it easier to map (less area!) but I'm still confused. Oh well. I guess I'll try and look over some tutorials. If anyone has some suggestions for my map I'd appreciate it.