Left 4 Dead: First Time in hammer (v1.0)

this map! Interested in L4D maps and have the ability to create L4D Radio's, Horde, Spawns, etc? Please help out the author of this map!
This is the authors first map, and his first time in hammer. He thinks he did a good job for the first time! Please tell him what you think and what he could do better. He also needs your help with