Should a 1 year old sapling be streaked to prevent the limbs from dragging or laying on the ground. I have read information on these trees and have found no answers to this particular question!
Blooming Weeping Cherry Tree
Certified GKH Gardening Expert
If the tree is leaning or need support, by all means stake the tree.
Pruning should only be done if it is absolutely necessary.
Here are some links with more information.