Customize my WIX Page

1. I have Buy Now buttons on my site, when buyers click that button, i need them to go straight to the checkout page with their personal details and credit card numbers (bypassing the cart). This needs to be a page, not a popup. 2. I want to add my own images, and testimonials to the checkout page, which will be on the right side. Example attached "download (38)". 3. After checkout, buyers will need to be taken to automatic upsell pages with another product. This page will have a button like "Yes add this to my order"/ "No Thanks. If they click no, it takes them to thank you page, if they click YES, it automatically charges them without having to put in their credit card again, is this even possible? 4. Add a thank you page that will have their downloadable content with a personalized URL for each buyer, or creates and account for them which they have to login to, whichever is easier. 5. I would like to know how you do these things so i can customize them myself later on or add things later myself. So I will ask for you to quickly explain how you did it through any video chat program or through my teamviewer.