General Please help check out problem

So I have absolutely no idea how to create a website. But....I am doing it. I have figured out the page linking and all of that but the one thing I cannot figure out is how to create a "shopping cart" or how to do my check out page so they can type information in. I am soooo hoping someone has a template that I can just edit. PLEASE help. I am switching over from an already made website to my very own in a few short days and it is not nearly done due to my lack of knowledge. I sell personalized products so there is a lot of info I need on my checkout page. THank you in advance for any help you can give.
Jessica Adams
Adams Occasionography