Cutting a Hole in a Wall and Putting a Cupboard Doors on It

Step 1: What should i do

I Have a Pantry. Its Pretty Basic It Has a Closet Door That Opens to Shelves. But if You Look Left You Have These Super Deep Shelves. Which Is Nice for Storage but a Pain When It Comes to Getting Anything Out of Them. My Plan Is to Cut a Hole on the Wall to Left of the Pantry Door Right in Front of the Shelves and Install Cupboard Doors. Never Done Anything Like This and Was Looking for Some Instructions and Advice and What to Name This Adventure So I Can Search It Properly.