Bobwhites are pretty nervous flighty birds however if raised from chicks, they can be tamed up somewhat. Handle them as much as you can as chicks, every day and many times throughout the day. Do this until you get them outside. They are still going to be stressed when you handle them but this handling as chicks will at least get them friendly enough to not be too afraid of you or learn to eat out of your hand. Bobs do not do well when handled as adults and can injure themselves if you don't handle them properly. And adults that have were never handled much as babies can actually go into shock from being handled for the first time as adults.
Food is a good motivator for bonding. When they see you coming with a bag of goodies, this will do wonders for their interest in you. Quail love greens, chopped veggies, quartered fruit, shredded cabbage, peas in the pod, corn on the cob, sprouts, meal worms, all kinds of things.