1. You will need to download the Actual mir 2 1.4 server files to play or use your 1.4 client as doaky has said above go to fernys to get everything required to make or edit a server.
2. You can run your own server if your specs are good enough .
My Preferences for hosting:
512mb Kinston DDR RAM
2200+ AMD 64 bit processor or better
2mb line or better
3. Use Map Editor | Mir Server Editor | DB commander ( for databases) | And a couple more if you want , depends how much of the server you wanna edit .