lol if you need to ask that question im afraid the vast ammount of information you must posses in order to maintain a server is probably a larger question than you can at this moment imagine.

of course its not impossible but it is fairly complex, only because of the fine tuning involved.
friend up with some one whos nice and is currently doing it. this is the best bet for you :)

https://developer.valvesoftware.com/wiki/CSGO_Workshop_For_Server_Operators