Dear,
I am a 19 year old who has been in designing since one year. As I am just starting as a freelancer, I don't have much experience, but I am willing to learn. I need a little more details about your work so that I can design that invoice as per your needs.
I believe I have an eye for designing and have fairly decent communication skills. I should be able to complete your work within two days.
Thank you,
Ketan