Shopping using bitcoin are easy as pie. You just need an online store that accepts bitcoin as payment.
Like newegg.com they are accepting bitcoin as mode of payment, you can follow their guide from here https://promotions.newegg.com/nepro/16-6277/index.html

If you're not satisfied with the guide above you can watch this youtube video how to shop on newegg.com with bitcoin https://www.youtube.com/watch?v=zDpx5wc1Bhs


If you have some extra time please read this first if you don't mind Newbies - Read before posting