The east side of a house isn't usually problematic. It's the north side in this hemisphere that can be a problem because of the lack of sun.
The east side gets morning sun, obviously. II think roses like morning sun. Roses wouldn't work for planters, though.
I keep petunias in my hanging baskets on the east side of my home, and they do just fine, especially the one that's closer to the southern side. Petunias are also very cheap and hard to kill. Just remember that hanging baskets dry out pretty quickly, so in the hot summer months, they'll need to be watered regularly. Another good one for baskets are geraniums.
I believe you can buy geraniums and petunias as 4 packs at a hardware store for probably a couple dollars.
Go to your local plant nursery with pictures of your location.
Your local nursery will have the a great idea on what grows. Don't forget to tell them about sun conditions and any trees that might put that side of the house in shade. If you want perennials, they'll get you those. Personally, I like a mix of perennials and spring, summer and fall blooming bulbs for really low maintenance gardening. I also add herbs like thyme and chives that flower, are useful, and are perennial/bulbs.
Clematis, iris, daffodil, tulips, grape hyacinth, hollyhocks.
Mums bloom in the fall, so you wouldn't see anything for awhile if you planted them in the spring.
Inpatients are always a nice choice, they bloom basically all summer and do well almost anywhere.
Personally, I'm very pro-native plants right now because they support pollinators.
I think they might be a good starting point for you. They use a 19 inch pot, so you can't include everything they do.
I'd skip the oregano or any herb if this is to be a flower garden style of compliation.
Black-eyed susan are native to your area and pretty widely available. Rosemary is also widely available. Begonias are pretty widely available, but you'd have to be careful not to get an overly large one. Gomphrena you will probably have to start from seed.
So maybe just Black eyed susans (late blooming) and Rosemary (long term) with some small begonias.