Hi K.,
Preparing your soil and location is key. Square foot gardening is loaded with ideas for getting as much produce compatibly situated in the smallest space. You can start really building up your soil by keeping a compost bin, but this requires turning every week or so. When it breaks down by the end of the season, it will boost your garden soil remarkably! That's covered in the square foot gardening book. Your energy level is also a consideration. If your daughter loves to be outdoors, you'll probably be OK with a garden that you can check on, weed, water a little every day. Mulching around your established plants will save a lot of weeding and watering energy. A good leaf mulch about 3 inches thick works well, and isn't acidic. When it breaks down, it will add to your soil. In your perimeter and walkways, you can lay down several layers of newspaper under the mulch to keep weeds out. You can buy alfalfa meal at your local agrisupply, and just sprinkle it around your plants for great fertilization without the risk of burning. It's a natural fertilizer (not chemical) so it will add to, not leech from, your soil. If you have water near your garden, you can place a soaker hose about 4" from the base of your plants throughout your garden. Water seeps out tiny holes along the length of the hose right into the soil, watering everything at once with minimal water evaporation. You can put a timer on your hose to make it easy to keep track of watering, and insure you won't forget and leave it on. Been there done that ; (. I keep herbs up close to the house, on the sunny side of the deck, so I can get to them while cooking. My favorite (and Rachel Ray's) is sweet basil, whose leaves can be cut all season, rinsed, patted dry, and frozen for use through the winter. Loose leaf lettuces make pretty borders right in your flower garden, but won't do well in scorching heat. Any vining veggie can be trained up fences, deck lattice, poles in teepees, etc. Green beans are fun for little kids to plant and harvest. If you plant 12 plants, 2 weeks apart until the end of June, you'll have a continuous harvest until fall. Roma tomatoes are the densest, and are great fresh or to cook with. You can freeze them whole, without peeling or anything. When you're ready to cook with them, just run them under warm water, and the skin will just slide right off. The rule of thumb for most plants is to grow 3-4 of each thing (at least) to insure good pollination and the best crop. (Except corn, which takes 3-4 rows, requires trenching and lots of water.) I try to weigh how much I'm really saving by growing something. For instance, a 4' x 4' square of garden sweet peas yields about one can of peas, which isn't worth the effort and space it takes. However, tomatoes yield about 20 per plant per season, which would cost $10 or more at the grocer. Spices are expensive to buy, and are stronger, fresher when used right off the plant. Even if you dry them, you're saving a lot of money by growing them. Some are natural insect and deer deterrents, too. In the winter, you can plant winter rye throughout your garden plots. It will grow bright green all winter, and then you turn it right into the soil a month before you plant in the spring. It's a natural fertilizer, will keep weeds from landing and taking root in the off season, and will build up your soil's nutrition for the new planting season. Sorry this is so long, but there are so many things to consider. Feel free to email any questions? J.