S.H.
Do gardening in pots/planters.
Go to your local garden store, and ask them, they will help you and what you need.
Easy plants: (which you can grow from seed or buy 'bedding plants' already growing in starter pots): marigolds, zinnias, green beans, sunflowers.
Buy: potting soil in bags to fill your planters with. Some garden gloves, fertilizer or "Miracle Gro", planter "saucers" to place under the pots to catch the water run-off so it doesn't get all over your porch floor...
**(adding this): OH! and buy a watering can, and maybe some gardening 'tools'... hand tools that are sized such that kids and adults can use them. Also, "nasturtiums" & geraniums are easy to grow too, and cute looking, and don't need much care.
Go to: www.burpee.com this is how I learned gardening when I was a child, my Grandpa would order things for me from here and we would grow it. I still order from them, and just ordered some seeds from them last week!
Gardening is SO much fun! I've been a gardener since I was a child, and it is one of my most fond memories.
Good luck,
Susan