Are you using some type of Translator cause i can't understand half of what you said.
1. I have no Idea
2. I think you mean how to change the building speed? you will need a lua script for that. try asking for it here:
http://unrealsoftware.de/forum_posts.php?post=120848#lastpost
3. Do you mean how to change the Price for buildings? if so then use this command after opening the in game console:
mp_building_price <building> <new price>
4. I think you are asking how to add friends in the USGN? First go here:
www.usgn.de and make an account. then start up cs2d and go to options>net. Then type in your USGN information. After that if you have a friend registered with the USGN you can add him/her by going to
www.usgn.de, logging in then go to manage friends. then type in your friends USGN name or USGN ID in the corresponding box.
5. I think you want unlimited buildings. Open the console and use:
mp_building_limit <building> <9999>
In this case you want to use the following:
mp_building_limit turret 9999
6. It also seems you want to have a friend join your server? If you cannot get him/her to join then report here and make sure you have every thing in order:
http://unrealsoftware.de/forum_posts.php?post=117400#lastpost
I hope this helped you!