Protecting Your Art
Prints are delicate and should be handled with care, this means avoiding touching the surface of the print as much as possible, do not store or display your print in humid locations or direct sunlight. 

Having your artwork professionally framed is the best way to make sure it is protected for the long run, it's also best for larger sized prints which can be trickier to frame at home.

Framing Materials
Acid free framing materials, such as an acid free mat and backing will help preserve the print, UV coated Acrylic or glass is recommended if the art will be placed in a sunny location. A dust cover backing is also recommended. 

Certificate Of Authenticity
These should be stored in an acid free envelope and can be adhered to the back of your frame for safe keeping, they should also be stored away from humidity and sunlight.

There are many online stores that sell premade or custom frames you can assemble yourself, look for acid free mats and backing (mounting board) when purchasing a frame.
If there are local frame shops in your area, it's worth contacting them to get a few quotes especially for larger sized prints, a skilled framer's experience goes a long way in creating the perfect piece.

American Frame - This company provides custom frames that can be assembled at home, it has many positive reviews and frame options that are well priced.