Hi Carol, you do so well with your other sub-tropicals, the Serissa should grow well for you. Part shade, your bay window should be fine. They do not like to dry out hard, they also don't want to be waterlogged. Generally pretty easy. They come from Taiwan and southern China, in the regions where winters are mild enough that citrus are grown. So they should tolerate temps well. Hot steamy summers and cool to cold, but mostly above freezing winters. They can tolerate frost, supossedly hardy thru zone 8 and in the ground maybe into warmer parts of zone 7.
For most people Serissa are easy, the are a few who can't keep them going, it does not matter their skill level. But seeing how your other trees and houseplants are doing you should have no trouble.
Your tree is quite young, basically in standard ''mallsai'' style. If it were mine I'd let it grow out and get bushy for a couple years, let it loose its shape. Maybe even move it to a larger nursery pot for a few years, Then prune it back hard to create something unique. Or if you like it as is, just keep it pruned to its current shape. I'm a fan of letting it grow out, then chop back hard. Mine at home I let branches grow out at least 6 inches to a foot or more, Then I chop it back to the first node, often less than an inch. You get good back budding, and a nice zig-zag pattern to the branches. Growing out will allow you to enjoy the flowers.
Branches are brittle, most people avoid using wire to shape them, Wire is okay on older branches, but be cautious with bending. Often used in ''clip and grow'' styles, both bonsai and penjing. And branches you prune off can easily be used to root cuttings. They are easy to propagate by cuttings.
have fun with it.