No hurry to prune anything. When you do, just the crossed branches and damaged ones. You could take that mess of water sprouts coming off the lower main branches. After the tree flowers would be better than now and the tree is still pretty small so the wounds should close quickly. From the pics I'd bet it's a sliver but will need more info to say for certain.

box elder with power lines going thru it.. not a great combination .. if the utility ever comes thru and wants to trim it.. ask them if they would remove it completely.. IMO ... if you visit in mid to late summer.. you may find a bazillion boxelder bugs around .. minding their own business ... ken

I'm starting to think this can be a very old and small Malus sylvestris or a related one... Not sure at all, anyway... https://commons.wikimedia.org/wiki/File:Malus_sylvestris_004.JPG

Yes, it is a camellia and yes, it can be propagated from cuttings. Growing Camellias from Cuttings