I would definitely encourage you to talk with your local co-op garden and see how they operate. We were members of a local co-op for a season right after our little one was born, and it is a great experience! Locally, they just put us on weeding detail when we had time to volunteer and also taught us about other aspects of gardening as we went along and they needed assistance with other tasks. We have wonderful pics of our little one when she was around 6 months old sitting in the row between us and helping weed! We only let our membership lapse because they had a surplus of vegetables that weren't our favorites (lots and lots of eggplant!), and because we found that we spend a little less on the vegetables we actually eat (and just enough for our consumption, since the co-op portions were more than generous), and we are still able to buy some of our veggies from the co-op since they sell at the local farmer's market what they have above and beyond their shares.