You're looking to replicate eBay's functionality using Bubble, a no-code development platform. To start, create a new account and register for a free trial. Familiarize yourself with the basics of Bubble through their Crash Course introductory videos and introductory lessons. You can then begin wireframing your product design or building necessary fields within your database. Using Bubble's visual design tool, shape your user interface, and configure your database to map out display and data fields for your application. Next, build listings by adding input fields such as free-text fields, image uploaders, and dropdown fields, and create a workflow to trigger the submission of new product entries into your database. You can then display products on your home page using repeating groups and configure navigation between pages. Additionally, you can integrate search functionality, navigate between pages, and display dynamic content on individual product pages. Finally, build a bidding or checkout experience by adding text elements, input fields, and bid buttons to facilitate transactions, and use the Stripe.js plugin to process credit card payments through Stripe. With Bubble's pre-built templates and plugins available, you can launch your marketplace without any additional costs.