Not bad for a first-ever map. A few things:
-This map is a little too simple for my taste.
-You should get the HR4 texture pack for in-game textures. This will not affect the map at all but it will enhance your paintball2 experience a ton.
-The secret pathway is too narrow and is not much fun. You should make it wider and add a few barrels or other obstacles in there.
-In this map's current state, it will not make the top 10 list for "best maps of all time". But if you keep working with BSP and spend a lot of time with your maps, eventually one of your maps might be so good that it will be considered an all-time great. Remember: DT, Cuso, Clipz, JopeZz, etc. were all noob mappers at some point.