If you ordered a spare string set with your harp, you will find it tucked inside your harp, or possibly inside the pocket of your case. Your tuning key will be in one of those places as well. Make sure you have found all of your accessories before you throw out any of the harp packing paper.
If you ordered a string set separately, you will have to be patient. String sets can take several weeks by the time we get in our regular string order and get your set made up. We are at the mercy of the string people, and have no control over that.