What helps
Good files, faster quote.
You do not need a designer. A phone photo in daylight beats a flash every time, and a rough sketch is genuinely enough to price from.
The artwork, as big as you have it
A vector or a high-resolution file if there is one. A screenshot works to start.
Roughly how big
Pace it out, or compare it to something. Size drives the price more than anything else.
Colours, if they matter
Brand codes if you have them. Otherwise a photo in daylight, no flash.
Floor or wall
It changes the backing, so it is worth saying up front.
Would rather just talk?
Call or message. Instagram DMs get read too.