I need to make a coupon (10 points best answer)?

I need a software that i can make flyers and coupons for my family buisness on we are setting up a booth at a fair type thing and need coupons so that when people visit our booth we can hand our coupon so they can come and use it but we dont have enough time to order off vistaprint so we need a softwre that i can download on my computer and make some and print them off so if you no a free software it would be much appreciated and it doesnt have to have a barcode or anything just something i can write one free lawn cut because we are a lawn care service but i need it to look proffesinal thanks