I want to be a system admin

Hello everyone, I just started college as a computer science student in our local state universities since I dont have that many choices and I want to be a SYSADMIN a good one actually but I dont know how yet, I need help for What I need to learn or have specific framework of what I'm suppose to study. I know thats this program is broad in computer lectures and theories and I want to be specific in sysadmin only