You must have acid soil 4.5 to 5 pH the soil must be well drained with rich compost. You should mix 1 to 2 bucketfuls of an acidic peat moss into each hole.
If you happen to have alkaline soil you really should dig a hole at least 3 feet deep and 6 feet across and fill with soil, acidic peat moss, sand, cottonseed meal and ammonium sulfate these are all very high in acidic and this will help your blueberries get a good start.
You can mulch your blueberries with wood chips, pine needles, and saw dust.
Don't forget birds love blueberries so you will have to net them before the berries begin to ripen. Make sure you can easily get the net off and on....you don't want to miss one of those wonderful berries.