You've picked a tough one. New hunter in Ontario using a bow. I don't hear good stories about Ontario moose hunting now.
Xman gave good advice. Calling seaon with a birch bark call.
If you haven't heard moose calling, it's tough to know what sound you are attempting to mimic.
If this is the case, maybe use the tin can and string method, which is a very good imitation of a bull calling.
Any can larger than a standard size can of pork and beans will do, with a 2 pound tin coffee can being about ideal.
Punch a hole with a nail in the bottom of the can in the centre.
Drop a shoe lace type string through the hole.
Tie a simple knot in the end that is in the can.
To use, hold the can up by the outsides of it, then pull your fingers over the string to stretch it tight and make a vibration, which amplifies into a very deep sounding grunt.
You may have to have a slight bit of moisture on the string to work properly.
If a leather lace is working properly, it is the best of any string.