N.W.
Depending on where you live, it's not too late to start. There are lots of fall, flowers & vegetables to grow in many climates. Here in southern NM, pansies, violas, snapdragons, some lettuce, spinach among many other things grow in the fall.
I would also suggest if you have never grown a garden, to start in a small area and grow from there. For instance I have five acres, but we just moved here and it is desert, I am doing one section at a time. I started with about a 15'x 15' area.
Find a local garden center, preferably not a chain, and go in and see what they have and ask questions. Most of them are great, sell quality plants, know the soil conditions and what grows in the area. They might cost you a little more, but in the long run it will save you money since you won't spend money on things that aren't going to live in your area. Stores like Walmart and Home Depot often sell things that aren't suited for the local climate.
Don't worry have fun, and just try something! My kids love it.