Thank you for reaching out and posting this question!
I understand you're looking to change the product images to a slider/carousel. You can use a third-party app, like Image Slider | Carousel | POWR, to replace the static product images. If you need any assistance with this app, the app developer is always available to assist you - you can reach out to them directly through the contact information found in the Support section of their app's page.
I've also taken a look at your website and I think it looks great! I love the variety of sections on the homepage. However, would removing the "Powered by Shopify" message be something that interests you?