First remove dead wood, always leaving a surface that has on overhang, so water does not sit on the cut surface ....if possible.
Next, the four removals are done.
straight UP GROWING branches.
DOWN GROWING branches.
IN GROWING branches.
one at least of all CROSSING branches.
Then step back and look at the tree from a distance. The end result you want looks like a BASKET, with light air and insects able to fly into the middle of the tree.
So...bring the top down to an even place. Bring the sides in. THINK about how many leaves and how much fruit will form. Remember you can rub off extra buds later so don't take off too much.
Save the Switches for the rabbits or dump in a goat pasture. Very good food for either animal. Also fine switches make good areation deep in the beds, or in compost bins. I use them in the bottom of my worm bins too.
These are the rules, as I practice, from my Brother in law, a master gardener who is fond of reciting the Latin names of everything.