Actually the Cisco course is what you need. CSIP or something? They have tons of videos and books. You should also seriously consider a home lab to play around

Actually the Cisco course is what you need. CSIP or something? They have tons of videos and books. You should also seriously consider a home lab to play around with the network config ... i.e. get routers, switches, etc. People sell homelabs after they do the cisco exam. I never did the exam but found the homelab and videos quite useful when I was in a position similar to you. Be prepared for a firehose of info and it takes A LOT of time.