Hi, welcome!

You might find it useful to pick up a yard of light white fabric, the kind that is filmy, if you can't find pre-made curtains of the same type. (I got some nice fabric at a big-box store off their $1 yard table. ) A push-rod that you can quickly put into the widnow at any height to hold the cloth will keep the direct sun from hitting the orchid, just in case there is an hour or two of "burn" going on while you are away.

This is a quick fix until you have a chance to look at your entire set-up. Cruise through this board for the threads about where people grow their orchids, and you will find some pictures and discussions of all kinds of window and other set-ups.

Have fun, your orchid is the beginning of an adventure, so don't be discouraged!