So I've created a website where I'm going to sell artwork. Is there somewhere I can learn exactly how to build an commerce portion for my website? I'll need the feature to supply referral codes. i'd also need it so if they click on a link, or enter a coupon code, it'll take off a certain amount on their purchase.
I'd need to know a good bit about this, so If anyone knows of a specific WSO, or could just help guide me with this, I'd appreciate it.