You don't see any maps at all? If that's the case, there's something wrong with your install.
However, if I'm correct in assuming from the title of the post that you don't see your maps, it's because maps don't appear in the list without the correct number of starting entities. I can't remember exactly, but I think you need 16 of each type. So you'd have 16 info_player_deathmatch, 16 info_good_start, and 16 info_evil_start.
Add as many info_player_starts as you want/need, these are the areas the player is "spawned" in right when they join, before they choose a team or anything. It's where you show off the main points of your map.