Good for you for first thinking of soil! You are in for an illuminating and rewarding challenge!
Building great soil must include cleansing, and not just amending.
Old home sites have hidden dangers. The chief one is lead contamination. Exterior paints prior to the late 1960's contained lead, and this paint was applied to homes and out buildings. This paint was rained on and the lead was washed into the soil, and it does not easily go away. Painted boards may have been left on the ground to rot and leave the heavy metal contamination behind. If you grow food there, many plants take up the lead and poison your child at the point of conception and pregnancy. This is the hidden danger of all soil contaminants like glyphosate (Roundup), and the use of arsenic based chicken medicines. If chickens were there and medicated, arsenic levels may be high.
So... wisdom is doing a soil test to look for heavy metal contaminants. Then you will be more sure of your long term health.
And do agricultural soil testing. I like Logan Labs in Ohio. They give a full spectrum mineral test for about $30, and is well worth it so you can truly know what your soil needs to be able to grow your medicine, for if our food plants are fully supported, they support us to health and vigor.
The good news is we have a remedy for lead contaminated soils. Sunflowers take up lead and can be grown to 3/4 maturity (most plants in bloom) and the entire plant removed and taken to a landfill. They contain your poisons. Save nothing, feed nothing from this crop, not even seed to birds. Two successive crops have been shown by scientists to bring heavily contaminated soils to below legal guidelines. The only way to be sure of this is to do extensive testing repeated over time. But most of us just adapt a proven method that ensures a remedy and do it. That is what I would do. In the second crop of sunflowers you could under-plant your cover crop to build soil while the the sunflowers cleanse it. If you pulled them just as they started to bloom, the cover crop would have more sun to collect more nitrogen, etc. and fix it in the soil. Note that these measures are most critical in the limited areas of the former buildings and the family dump sites and downstream from them in sediment basins.
I have looked in vain for the scientific paper on this. Someone else may have the link.
There are many websites dedicated to soil repair. My personal favorite is http://bionutrient.org/
where the latest broad scope sciences drives simple non-technical solutions accessible to all of us who want to escape the chemical companies and return to what I call Creation Farming. This is all offered completely free with no sign in required! Hurray for the Bionutrient Food Association (BFA). If you go to the BFA site, check out the LIBRARY tab and listen to some of the speakers. Plan to be astonished! You can also find many videos by BFA at their YouTube page.
One of my favorite gurus is Dan Kitredge who started BFA, and he led me to such brilliant consultants as John Kempf who consults with farmers all over America. His lectures are at the BFA site and you can find him on YouTube. Also, if you will have grassland pasture, you will want to listen to Fred Provenza's YouTube channel.
All the best to you as you go down this wonderful journey! Get out there and do some good!