Total newbie to Shopify, in fact I haven't even signed up yet.

Before I do just a couple of simple questions:

1) is it possible to have a card checkout on the actually product page? Or at the very least a Buy Now button as well as a Add to Basket?

2) All my products will share the same pricing and variations, can I at the press of a button change the basic pricing and product options across all products? If so how?

3) Lastly what is a good theme for selling framed art? I saw one where in the gallery there was a quick view symbol on each product and when you clicked it a mini-checkout/product page popped up - looked cool on desktop, wasn't that great on mobile. I think it was a Shopify site, is it a standard feature?

Thanks in advance.