I'd say a great starter server would be Flash. The only major difficulty you would have is grenades. Maybe Anzio, although there are a lot of detours and sneaky spots.
Flash was the first map I ever played on. It is the only map I can really have fun with too. I die way too much on most other maps. :P Anzio is also a good map, and Donner is fine. Hands down though, Flash is my favourite.