I think you can start either way.
If you start with sway bars it will stiffen the handling, but not change the suspension firmness. The cornering will improve with sway bars. then you can select the springs and shock combo you wish to go with, unless you have a coil over combo you want to go with.
If you start with springs you will lower center of gravity and stiffen the springs, but it will be improved and you will definitely enjoy it.