New servers are always welcome. 20 slot is pretty big, i hope you will run mostly big maps on it.
Most of the GES maps, especally the _classic ones won't have a good gaming experience with 20 ppl on it.
I suggest you to lower the ammount of slots to somewhat arround 8-16 depending on the maps you are going to run on it. (e.g. archives, runway, egypt, temple_classic,... can handle much more players then stack/basment/complex_classic)
What Gamemodes and weaponsets are you going to run on the server?
There are allready a lot of servers with DM or LtK and random weaponsets, so there should be some Servers with other setings too. What about YOLT/Team YOLT or maybe a noradar server.