It;'s hard to have any brew stuff go 'bad'
Hops in a sealed pack will stay indefinitely in the freezer,
Dried yeast will live a long long time in the fridge.
UNmilled grain will last upwards of a year (again, sealed and in cool conditions)
DME will last forever (almost)
LME will last a long time, though t may not be it's best after long storage.
If you do want to get rid of some inventory, though, go to town
Usually they say a pack of dried yeast can be sprinkled right on top, though I prefer to rehydrate before pitching. (I would keep rehydration temps around 70 - 80 range; closer to fermenting temps is best for the yeast ) It will work at lower temps, though a couple degrees higher wouldn't hurt.
Depending on what style you're shooting for, black malt may or may not be too much; I think it's good for a big stout, it has a pretty evident flavor.