Two things come to mind. The first is to check out published soil maps of areas that you are interested in. That will tell you the quality of the land so that you don't buy something full of rocks or which floods seasonally. Also find out the prevailing soil pH if plants you wish to grow are finnicky about having an acidic soil (or not).
The second thing is not to get too ambitious. While you can use herbicides there in the USA that are not allowed where I am, the weeds are much, much worse in the country than in town. So if you currently live in an urban area that is something to consider. If you're already rural then you will already know what to expect. There is likely to be a lot of hand-weeding unless you wish to use herbicides, so the manageable area in the former case could well be less than you could manage in an urban area.
I just thought of another thing - irrigation. Make sure there is a good water source if you wish to grow thirsty plants.
