We are in South California, the previous owner said this peach tree has been planted for a year and half and I plan to prune it to a better shape.

As you can see in the picture, to the front there's no branches, branch #2 and #3 are stronger, but on #2 there are a bunch of vertical growing ones (2A). Do I need to prune the main branch? Get rid of 2As and prune back #2 and #3? My last peach tree was cut 3 ft tall directly after planted but didn't have experience with already established ones.

Any suggestions are greatly appreciated!