When using the shopping cart feature, do all products available need to be on the same web page? Can a user browser through multiple pages, adding items to their cart from several different pages and then checkout when done?
Your product can be distributed all over the site as long as all the pages are on the same domain.You do need a VIEW CART button on all the pages which contain a product.
what code should i put on shopping cart for customers to checkout?
Your E-junkie shopping cart will automatically display a checkout button for each of the payment processors you have set up in your E-junkie account:http://www.e-junkie.com/ej/help.payment.processors.htm
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