How big are they? If they're 10 feet tall they're probably climbers. You could tidy them up a bit pruning wise. Cut out any obvious dead bits, right to the bottom if necessary. Assuming they're most likely bush types I'd cut all stems down to about a foot high, cut to just above an outward facing bud. You want an open structure not a tangled mess. Don't be scared to go hard, it's a shot to nothing and most roses like (or at least respond well to) hard pruning. You could wait until the forsythia flowers but really might as well act now while you remember.
That's what I'd do anyway. If they end up looking like goers, you could obviously feed them as well.
Oh yeah, and don't plant them too close.
