What do you have in mind for the style and theme of the landing page?
Good competitor sites are borrowlenses.com, lensrentals.com. Good p2p sites are getaround.com, airbnb.com, spinlister.com. Because it's a photo site, I think we should heavily use high quality photos: gear, happy photographers, etc. Photographers have told me the first thing they're interested in is if there are cameras in their area, so maybe a zip-code search or map showing where we have the most listings will communicate this.
Elements to include in the landing page
Big search box. How it works. As seen on. Are we in your neighborhood. Featured items. Testimonials.
Keep the existing header. Try to match the overall style of the existing site, but of course the landing page can be a bit more stand-out -- it is unlike all other pages on the site.