First-time home and yard owner and aspirational gardener here. The place we bought has a large yard with several trees and a border of mostly lilac trees, but there are lots of mystery plants mixed in. I don't know who is supposed to be there and who isn't. (Previous owners seemed to let things get a bit overgrown.)

I've been using Google images to figure some things out, but I get mixed results with the plant IDs, and I'd also like some more specific advice about what should go where in my particular setup.

Is there someone I could hire to go around the property with me and help me understand what I've got, and give advice on what else to plant to complement what is there?

Would a landscaping service do this? I'm sorry if this is a dumb question. Any advice appreciated!