Q.fruit tree shaping
I have two dwarf apple trees and 1 semi dwarf pear tree and they are all vase shaped and they did not bear fruit this year. They are all 3-5 years old. I would like to shape them different so they will bear fruit. Where should I start?

I have listed a few links for you with more information.
You mention you only have one Pear Tree, you will need another tree to provide a pollinator.
Also some varieties may not produce fruit until they are 5 to 6 years old.
Dwarf varieties do generally produce fruit sooner.
https://www.gardeningknowhow.com/edible/fruits/apples/no-fruit-on-apple-trees.htm
https://www.gardeningknowhow.com/edible/fruits/pear/no-pears-on-tree.htm
https://www.gardeningknowhow.com/edible/fruits/apples/pruning-apple-trees.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-pruning.htm
https://www.gardeningknowhow.com/edible/fruits/pear/pear-tree-pruning.htm