McInnes knows importance of winning derbies as he prepares for Old Firm dugout debutWhen Derek McInnes took over as Rangers manager, this was surely the fixture he was anticipating the most: his first taste of the Old Firm derby from the dugout.It has come along a week earlier than planned. Rangers are due at Celtic Park next Sunday for a Premiership clash but as are the quirks of the Scottish football calendar, the Premier Sports Cup quarter-final draw has pitted the two Glasgow clubs together.So McInnes will have the comfort of Ibrox for his managerial derby debut. The boyhood Rangers fan and former player will be surrounded by like-minded souls, as no Celtic supporters are permitted to attend. And having won his past four matches after a rocky start in Govan, there is momentum building.Rangers manager Derek McInnes will take charge on an Old Firm fixture against Celtic for the first time on Sunday. (Photo by Rob Casey / SNS Group)…