Hi Stephanie...I've never personally grown either lentils (from the bean family) or chick peas (from the pea family), but they're no harder to grow than beans and peas. I am assuming, though, that unless you want to eat them fresh, you would have to grow a HUGE quantity if you want to dry them for later use. It would obviously depend on the room you have available in the garden. But I do know they can be used fresh off the vine and out of the pods, just like beans and peas. Lentils, however, are a cold weaether starter...in other words, they sprout from seed in COLD weather, not warm, so sowing in the winter or at the first frost is best.
I have grown a couple of types of drying dwarf beans (from southern seed exchange and koanga) depending on the variety I got between 400g and 600 g from about 45 plants, so you need a large area to make it worthwhile. drying types of pea are easy to grow and dry off quickly, but again to save enough for a meal you need a lot of plants, although of course you can add just a handful to soups. I am growing some soybeans from koanga this year, the plants are up and looking good so far, will probably eat them edamame style. Shellout varieties of climbing beans such as bob's bean are my favourite thing though, I make delicious bean salads with them, and even scarlet runner seeds when they are fat but before they dry out are bulky and with dressing taste fine, and they are great precooked then added to a minestrone type soup.
you have to let legumes dry on the plant, until the pods are crisp, otherwise the seeds will rot, and I think growing them to eat at shellout stage is yummier.