Welcome to Linux Questions
So you have no experience with Linux what so ever ? (We were all there once before) You'll need to read the Centos Wiki over at there site. I always recommend the Slackbook (( http://www.slackbook.org/html/index.html
)) for newbies as a reference.
This book really helped me when i was first beginning with Linux http://tldp.org/LDP/Linux-Filesystem-Hierarchy/html/
Hope it all goes well and good luck