Hello Ellie

We do not have an expert in Bonsai at the moment. However, articles by Extension are research-based and the information is reliable.

Here is a beginner article with plant lists.

Bonsai DIY lists beginner plants- https://mbgna.umich.edu/matthaei-botanical-gardens/gardens/bonsai-and-penjing-collection/bonsai-diy/

Among the plants in the above article, the junipers are probably the hardiest plants here in Michigan.

You might look at the Meijer Garden and Chicago Botanic Garden bonsai collections, too. Have you checked with Bonsai clubs in your area? They can be a great resource. Here are a couple examples:

https://www.facebook.com/West.Michigan.Bonsai.Club/

http://www.bonsaisocietykalamazoo.org