I have the sims 3 and I thought it would be cool to start a garden, but I'm not sure how to....
Get some seeds (or go to the store and buy the fruit or veggie) and start planting in your backyard. Is that what you're talking about? A home garden? Find an area on your property and start planting. I usually have big gardens. It would be cool if they'd make it so we can have greenhouses. You can go into your build tools if you want to make it look more like a garden. If you need to, take a gardening class which will give you some starter seeds and start planting and keep building your gardening skill so you can plant higher level stuff. I usually have one sim who's a master at fishing, cooking, and gardening and that way I don't have to buy food from the store. :D