To all of that good advice, I would add - pay close attention to the individual plants. Look for good traits (earliness, productivity, disease resistance) and tag those plants for further development. Numbered tags & good notes will increase the likelihood of getting good results. If possible, open the first dry pod while on each plant, to examine the seed coat - if something interesting, make a point of tagging the plant & saving those pods separately (which may greatly reduce the time required to stabilize it). Any plants not tagged are automatically "bean pot".
And for beans, I would recommend sampling at least one pod from each plant as a snap. You wouldn't want to inadvertently overlook a great-flavored stringless snap while chasing seed coat color. As pretty as beans are, we need to remind ourselves that a pretty but unpalatable bean is unlikely to survive as anything other than a novelty. (says the bean pot, calling the kettle black

)