Thank you for your question. Master Gardeners and Extension do not do individual consultation on yards, landscaping, or flowers. I would encourage you to check out the U of MN Extension website for ideas of flowers and flower beds you can add to your small yard:

https://extension.umn.edu/find-plants/flowers

I would also visit your library, which offers many books on flowers for you to visualize what you might want. Also, there are many garden designs on websites, such as this resource: 

https://www.gardendesign.com/ideas/

Since you have a small city lot, here are some ideas of urban gardening:

https://extension.umn.edu/lawns-and-landscapes/landscape-design

https://extension.umn.edu/source-magazine/gardening-change