Crash course on CIO

My 8 month baby boy is waking 4-5 times a night still. I have a full a 6 year old as well as a full time career (with commute). He is breastfed but I know for certain he is full when he goes down every night. I've fed him formula several times before bed just to try. I am an AP mom who is willing to go against everything my gut has told me and move him to his own room to cry it out. I've made my decision. However I don't have time to read up on proper method for this technique. Do you go in when he cries then wait how many minutes? How long do you let them cry? Any and all advice on how to support my decision is appreciated. Please no lectures on the harm of cio. He's 8 months already.