As you work on incorporating props into your speech, here are a couple additional suggestions to consider implementing.
Assignment:
Make sure you practice your speech, with any props you have, three times through. This is a minimum requirement, as you are bound to have prop malfunctions to work through as you practice that you will need to fix.
Going through practices in which your props fail can be very helpful, as you can learn how to improvise. Remember, the props are not the speech. They simply support your speech, similar to body language and vocal variation.