If you are a minor under 18 years old, you may sue a person in small claims court, but you must have a parent or guardian complete and sign a small claims petition.
Yes. A minor may be sued, but no judgment may be entered against a minor unless the minor is represented by a guardian ad litem. (A guardian ad litem is a person, usually an attorney, appointed by the court to represent the interests of a minor in court.) See Iowa Rule of Civil Procedure 1.211. Suing a minor involves numerous legal issues, and you should talk to an attorney.