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@Oswald
You're best off if your going to use indexed shifters to match the cassette to the shifter eg both 9 speed .. It's possible to match the different combination but you have by setting the shifter up in the middle of the cassette so the accumulation of the error is minimised at the two ends of the cassette, even then though the shift performance will be worse as you reach the extremes. It's a bodge to keep you riding ..
For the rear derailleur you'll also need to match manufacturer Eg Shimano in you case as the cable clamp is in a different position to Campagnolo which dictates how far the mech moves for a certain cable pull from the shifter. Again there are work a rounds!