You are describing conditions that will not allow plants to grow. No sun.  No moisture.  You will have to   change the conditions and, as you cannot change the amount of sun, you will have to make sure that you water the areas.  You  need to start from scratch by checking your soil.  You need to figure out if you have sand, clay, rocks, or loam, which is good rich black dirt.  Most wild flowers need to be planted in the fall and overwinter in the soil.  The  easiest beginner project would be perennials that can grow in tough sites.  I am giving you a link to our publication, 30 Plants for Tough Sites.  Download the information and then go to the section of dry shade.  If you have sand or clay, mixing  in some compost will  help the soil.  Make friends with you locally owned garden center employees and they should be able to guide you or check with friends or family for tips.  Also, our home page has multiple links to informational pages.  Under About,  go to the bottom and click on the Yard & Garden link.  Good luck.

https://conservancy.umn.edu/items/05290247-4a5f-4bd1-b401-65bf59dc089a