Depends on the soil that you're going to grow in. You might need to dig a hole and mix in some perlite or vermiculite. Dig up a clump of dirt and squeeze it in your hands. Does it clump together or does it easily fall apart? I would add a bag of perlite no matter what. Then put the soil back loosely and throw your beans on top of it. Cover them to a depth of about 1/2" and water. Then sit back and see what happens.

You also might want to start the plants indoors and then transplant them outdoors. That's what I'd do.

Laterz