I want to plant blueberries. What is the first step?
The first thing you should do is check the soil pH of your proposed planting site. Blueberries require an acid soil (4.5 to 5.5) and I would recommend against planting if the soil pH was 6 or above. If the soil pH is to high I would recommend acidifying the soil with sulfur before you plant (This could take several years) or bringing in soil that is acidic to plant in.
Here is an article I wrote several years ago on acidifying the soil for blueberries.