See those thick roots, attached to a strong stem, with healthy buds already? Notice there is no damage to any of the roots from being dug up. Notice that the roots clearly grew around a mound of dirt, spaced evenly around the plant. That is a healthy plant!
When you first receive the roses, put the roots in a bucket of water to soak the roots.
Notice those clean cuts? That's what you want to see!
Next dig up a really large hole for the plant. Typically you don't need to dig a hole much larger than the rootball. But for bare root plants, the hole should be much larger so the roots have room without having to crunch them together to fit the plant. Long, deep, wide holes with a mound of dirt in the center. Spread those (perfectly spaced and already trained to spread) roots around the mound of soil. Backfill with soil, and a layer of mulch and the roses are ready to be watered again!
Once the plant is firmly in the ground and you've patted the soil and mulch around the roots. Apply a generous amount of water around the plant, so the water soaks all the way down to the bottom of the roots. This will help encourage the plant to "wake up", and help the plant get established. Apply deep watering applications as often as the ground is dried up about 1-2 inches deep.
We realize that if you aren't a plant person, these plants look like nothing. But give it a few months and you'll be drooling over these luscious roses.