Doesn't seem like the best of ideas to advertise that you are insured when you are not. What are you going to do if someone calls because they see the flyer, and say:
I see that you are licensed and insured, come give me an estimate and bring a certificate of insurance.
If you are going to go into a business, do it right from the start. You will be a lot happier
I don't mind spending money, I mind wasting money!