O'Neills role at Homeworld security

Can someone help me out I'm trying to understand, when Jack gets promoted from the SGC to homeworld security what exactly is his job? Who would he be responsible for, is he landry's boss? Or more of an air force representative at the pentagon? And how quickly after things happen at the SGC would he hear about it? Would he have to wait until the end of the day to read a report, would he even get the reports every day? Maybe if something happened to SG1 Landry would phone him straight away?

I'm a little bit stoned and I'm hyper analyzing season 10, I'm having so much fun 😁