It sounds like an unnecessary step, but if you don’t know what you have to start with, you won’t know if you need to add anything—and why waste money on adding nutrients you don’t need?
Once you’ve decided on a location, get a soil test. It sounds like an unnecessary step, but if you don’t know what you have to start with, you won’t know if you need to add anything—and why waste money on adding nutrients you don’t need?