First of all, check with the gallery owner for advice. It's tough when you're multi-talented and have to "choose". (I know, I'm a fiber artist-and a painter-and a weaver-and love crafts, etc)
Since you were asked while you were drawing/painting, maybe that could be your focus...for now, anyway. If the gallery is big, you could show some of your best smaller pieces to complement the wall pieces. You need a good sized space to keep it from looking unfocused and cluttery. Your beautiful pieces would get "lost".
As far as pricing goes, keep in mind that galleries take a commission (usually in the 40-50% range). Look around the web, there's lots of sites that can help with getting going selling your artwork.
A couple of sites that may interest you would be www.wetcanvas.com and www.penciljack.com. There's others, too.
Remember, one step at a time, try not to feel too overwhelmed. Oh, and usually YOU'RE the one that has to search out galleries to hang your work-you're already one step ahead of the game!
Good luck! (post a photo of the quilt when you finish it!!)