zlien does not have any forms or templates for initiating court actions. While there may be form/template repositories on the internet that you may search, it is generally best practice to enlist the assistance of a local attorney who can make sure all formal requirements are met and that your petition is in compliance with any applicable local rules.
Generally, your petition will need to note that it is a Petition for Hearing to Determine the Validity of Lien made pursuant to Section 43-17.1 of the Virginia Code, and should include the relevant information related to the lien claim. Notice the petition must be given to the lien claimant and any party to whom the benefit of the lien would inure and who has given notice as provided by section 43-18 of the Code of Virginia. The specific formal requirements of the petition in your county may be at least partially determined by local rules, so you should have a local attorney assist you.