make sure you dig the surrounding area up a bit so and water a day or three prior to releasing the worms as loosening the soil will aid them re-establishing a home and the water makes tunneling easier with the soil broken up and damp it's a win/win. you won't lose as many worms to predators either due to the worms not having to tunnel through dry, compact soil. Good Luck!
P.S. don't forget some composted vegetative matter for the worms to eat.
Yea i was wondwring how i apply the worms thanks for the info. I plan on putting alfalfa ontop of the soil for the worms food amd all the leaves off the plants. The layer of alfalfa with protect the worms feom birds and other predators.. i going to do a mix night crawlers to dig deeper in the soil and red wigglers for top of soil.