Bootstrap migration from PHP

I have a site with adult entertainment items (DVDs and Clips) for purchase. Now, 10 years later, I want to update the site to Bootstrap. That part I probably can do myself, and I have with 5 other of my sites, except that for this one, there is a shopping cart involved. I have a shopping cart picked out. I'd like to either use it, or you have one similar, that you know how to work - from displaying items from a catalog, to (the customer) adding items to cart, to checking out. If you don't want to personally see adult entertainment items, you can build something using sample items of your choosing, and I will carry it over to my site. My items are in an SQL table. I have working PHP routines in place to pick the items to display. I have image names, product IDs, product descriptions, product prices. All those things shopping carts typically have. I have a lot of items. So many (~500), that customers "filter" by niche, with about 50 items being the max per niche. My current PHP site puts 3 items in each horizontal row. 4 across might be the max. If you can build one row as an example, I can follow your lead with a dozen rows! My site doesn't do PayPal, so my "checkout" page doesn't need any PayPal interface. I use CCBill, and I have about 10 lines of PHP "form" code to accomplish that. (I have a separate page that processes their IPN.) The checkout page needs to only review the items in the shopping cart, I then present the customer with a handful of options to use to pay, as "form" submit buttons or clickable links. Summary: I need a Bootstrap catalog display, Bootstrap (JS) shopping cart, and hand-off of the data to a Bootstrap checkout page.