When I play Reach on Xbox One, how much of my data/dlc will carry over?
All of it. If you have game saves, put them into your cloud storage so they can be accessed. All DLC for Reach will transfer so it will be just like playing it on the 360 
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> All of it. If you have game saves, put them into your cloud storage so they can be accessed. All DLC for Reach will transfer so it will be just like playing it on the 360
I kind of don’t have a 360 anymore… :-S
If you played Reach online it should.
My Gears of War 3 data carried over.
The DLC will be available to download for you if you purchased it before, in the “My Games and Apps” folder you can click start on Reach, then go to manage game and the DLC’s will be there for you(That’s how the Gears games worked).