To the store you can connect one or many different payment processors to start collecting payments. You will find them by going to Store -> Settings -> Payments You need to create an account with the payment processor and add the credentials ...
To create a new page click on Pages button in middle left of your screen. Then click on Add New button on top It will open up the options for Page, Popup, Folder etc. and click on Page That will open up a window with the different designs available ...