I'm an hour east of you and into only my third year so I don't have all the answers obviously. I'll just offer what I've learned and believe to be best in our climate.
Trees want to and are supposed to live outside. The more we fight that the harder it is to have happy trees and happy growers. I have too many tropicals fighting for my one large south facing window. Best luck with Ficus and Serissa by far for me. Fukien Tea have been pest magnets but ok. Jade are easy and fun. A bit of green to survive Ohio winter. When it's consistently above 50, bring those trees out. They'll be happier even in a shady back yard.
You have a back yard and I suggest using it. Many trees will grow fine in part sun including J Mapes,Juniper and spruce.
We're in Zone 6 and a tree in a pot looses at least a zone. Look for trees hardy to zone 4 and save yourself the hassle of providing a lot of extra protection. I have too many which are pushing winter hardiness in our climate and require fussing over them like Dawn Redwood, Bald Cypress, Japanese and Texas Cedar.
I don't know if you can but digging local trees (yamadori) is the way to go. They like our climate and you can save years of growing time by collecting trees Mother Nature has given you a head start. Hornbeam and Hemlock are plentiful in our area and as an under story tree, they will appreciate your shady yard. Elm are everywhere and they just don't care
One last tip is Urban Yamadori. Better know as peoples old landscape plants. Boxwood, Azalea (my Fav) Juniper and Taxas Yew are everywhere. Maybe already in your back yard? Watch for new landscaping jobs in your neighborhood, remodeling/construction sites. Often good starter trees can be free.
You don't HAVE to spend a lot of money to enjoy the hobby. It's been my cheapest hobby ever
Columbus Bonsai Society has workshops. I've been meaning to get over there but... Maples in March is coming up and I'd like to attend. They have a website and facebook.
Hope this is useful information I've learned here and from trial and error. Listen to what the people offer you here and do it. I didn't always take the advice only to find out they were right most often.
Keep it fun and relaxing is my best advice.