Hm, from your example now I'm not clear whether you want to customize the thank-you email message we send to the buyer, or the thank-you page they can view in their browser after completing checkout? Since your email address and website URL would be the same for all your buyers, there's no variable for those; you can just type those into your templates directly.
For thank-you email customization, please see this help page:
Thank-you emails are plaintext only (no HTML), and we would recommend keeping these as brief and to-the-point as possible to minimize the chances that anything in the message could result in the message getting mistakenly flagged as spam. If you need to include URLs, we would recommend putting them on a separate line, similar to how I'm presenting links here; however, the more URLs you put in an email, the more likely it could get flagged as spam. Try to save links and promotional text for the thank-you page.
Since you are not selling any digital products such as downloads, we would recommend leaving the Email Message fields blank in your product settings, and just rely on the single Common Thank-you Email in your Seller Admin > Account Preferences (if you even want to send an email at all). Note that since the Common email is not linked to any particular product, it cannot include any product-specific information. The default Common Thank-you Email template we provide for you already includes the [%thankyou_link%] variable which inserts a link to the buyer's common thank-you page listing all items in their order.
If you want to show any info from the buyer's order on their thank-you page, then you should not redirect to a thank-you page on your own site. You can use regular HTML to customize your thank-you pages, insert links or sign-up forms, etc. See the example link I provided above to get an idea of where item-specific vs. common thank-you page customizations would get inserted into the page.