Once you find a product you like, add it to your shopping cart. After you have added all your desired products, proceed to checkout. Here you have the option to add more quantities or delete products from your cart. To estimate shipping costs, add your post code and 'get a quote'. Remember to 'update the total' to find out total costs.
Register an account with Learn to Shop to add to the simulated shopping experience. Then proceed to add billing and shipping information. This is an educational site aimed to reproduce the experience of online shopping and no actual items will be delivered to you.
On a real shopping site, this page would have much more information about purchasing and delivery details.