I did/do most of the homesteading work in our 1 acre back yard. Since I am now 65 and handicapped I need a lot of help on any large project but this was not always so! I am only 5 ft 2 inches tall, but there are a lot of ways to make the physical work easier.
If you live in a house with a back yard, can you start right now or would that hurt your property value? Different areas expect different things of property owners, and since you want to sell the house you will want to keep the property value up.
At any rate, I think an excellent place to start would be to grow a variety of salad greens. I plant a bed of them and my salads tend to be half bought lettuce and the other half will be rainbow swiss chard, bok choi, spinach, etc from my raised bed.
ALso children adore cherry tomatos! They love to pick them and eat them right off the plant.
In my area of late frosts my fruit trees do not always bear, but when they do bear they are great. This year I am pretty sure I got 60 pounds of fruit from the 2 dwarf trees that did bear. The apples did not bear because we got a frost just as the apples bloomed.
This summer my husband helped me build 2 more raised beds. I have a bed of onions that winter over and can give me onions all year round. I will now include, I hope, a bed of potatos that will winter over but I am not sure I will succeed with this: This will be my third year growing potatos and there is a great deal that I have not yet learned.