Where will you hang your art? The place you intend to hang your art will determine its longevity. Anything hung in direct sunlight or near a heat source will degrade. Ultraviolet light is very destructive to pigments, paper, canvas (and to practically everything else). Heat causes paint to crack, wood to shrink, canvas and paper to dry and age rapidly. Consider the spot carefully. Whether you frame your new piece or not, excessive sunlight and heat should be avoided. To a certain extent, UV damage can be mitigated with anti-UV glass, but not totally eliminated. Don’t hang something in the sun unless you don’t care that it won’t last.
If you forgo the “ready to hang” option and purchase a work of art that is “ready for framing,” there is one decision you have to make before you meet with a professional framer:
Do you want this artwork to last? That is, do you want your artwork framed to archival quality?
These two questions are actually the same question. A framer who works to archival standards will carefully use only materials that are acid-free: papers, mats, tabs, adhesives, even distilled water to moisten adhesives rather than tap water. Why? Because acidic materials are extremely destructive over time, and the destruction they wreak on artwork cannot be reversed. Yes, some acid staining and degradation could be partially restored with careful painstaking techniques, but it cannot be made new again. It’s better to go acid-free from the beginning. Museums use archival methods for all matted and framed art. If you want your art to last, go archival. With this in mind, be certain the framer you choose is able to work to archival standards. Ask.
There are, of course, many other questions you can explore with your framer: mat colors, whether or not to float-mount a print with a deckle edge, to add glass or not, choices of frame. But these are personal aesthetic questions for specific artwork, questions that will allow you to develop a long and trusting relationship with your framer.