Brought Deticated Server (Linux) Now What? :(

My friend brought a deticated server from: After he rented the server xlhost gave us this information for our server:

Main IP:
Subnet :
Other IP:
SSH ID and Pass

I believe they gave us the CentOs O/S, we don't know what to do from here, what are you suppose to do with that info? I was hoping for something like remote desktop.  I downloaded putty and logged in successfully to the server but where do i go from here? we are trying to host some deticated counter-strike servers. Im looking for some information on the purpose of putty, and how to use it and also how i can get remote desktop on this server?
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