HTML Validation for VintageMandolin.com

I need the HTML code for my website, vintage mandolin.com, validated or rewritten as needed. The W3C Validator has reported lots of errors. Requirements: - Review and fix HTML code - Ensure compliance... (Budget: $250 - $750 USD, Jobs: CSS, Debugging, HTML, HTML5, JavaScript, Web Design, Web Development, Website Development, Website Optimization)