Planting cowpeas (black eyed peas) in containers

Hey guys,
I am new to planting here and started of with cowpeas because we were cooking them last week and so took some and put them in some wet tissue and in a plastic bag to germinate and they have grown really well for the past 5 days and thought it was about time to plant them. I put them in a container with some compost which I got from the store (the tomato grow bag, only one I could find). Any tips to help me to get the best results and not kill the new seedlings.