1. Create a Website: Build a professional website for your business where you can showcase your products. You can use platforms like Shopify, WooCommerce, or Squarespace to set up an online store quickly.

2. Search Engine Optimization (SEO): Optimize your website for search engines so that users can find your products when searching for terms like "metal heavy-duty wheelbarrow" or "wheelbarrow for sale." Use relevant keywords, meta tags, and descriptions to improve your website's ranking in search results.

3. Product Descriptions and High-Quality Images: Provide detailed product descriptions and high-quality images of your wheelbarrows on your website. This helps customers understand the features and benefits of your products and gives them a clear idea of what they are buying.

4. Online Marketplaces: List your products on popular online marketplaces like Amazon, eBay, and Etsy. These platforms already have a large user base, and it can help you reach a wider audience.

5. Social Media: Leverage social media platforms like Facebook, Instagram, and Twitter to promote your products. Share engaging posts, images, and videos to attract potential customers and drive traffic to your website.

6. Paid Advertising: Consider investing in paid advertising on platforms like Google Ads or social media ads. Target relevant keywords and demographics to reach users who are interested in buying wheelbarrows.

7. Content Marketing: Create valuable content related to gardening, construction, or DIY projects that can attract potential customers to your website. This can be in the form of blog posts, guides, or instructional videos.

8. Email Marketing: Collect email addresses from visitors to your website and build an email list. Send regular updates, promotions, and product offers to keep customers engaged and informed.

9. Collaborations and Partnerships: Partner with relevant influencers, gardening blogs, or construction websites to promote your wheelbarrows. Collaborations can help you tap into their existing audiences.

10. Customer Reviews: Encourage customers to leave reviews and testimonials on your website and other platforms. Positive reviews can build trust and influence potential buyers.

11. Customer Support: Provide excellent customer support to ensure a positive shopping experience. Respond promptly to inquiries and address any issues or concerns customers may have.

12. Local Marketing: If you have a physical store or warehouse, consider local marketing efforts such as distributing flyers, attending trade shows, or sponsoring community events.

Remember, building an online presence takes time and effort. Consistency and persistence in your marketing efforts will help you gradually expand your reach and attract more customers to your METAL HEAVY DUTY WHEEL BARROW products.