My mom and I love going to a local auction house. We love it SO much, tha we rarely go

Too tempting to bid on so many different things.
Last year, my mom went and won a lot. She bought it because it contained a set of placemats we used to own and we've missed them (total luck and we are so happy).
The lot also included a box of art prints (lithographs?) My mom really liked them and held on to them...until yesterday. I guess she was inspired by my participation in the "Get Rid of 50 Things" thread? Anyway, she told me to sell them online.
Um, yeah, I sell things that I at least have a clue about...or a clue of where to look in order to learn more about something.
A box of art prints? Where do I begin? There are flowers, birds, ships, woodland scenes...and it looks like the person who owned them before tried to sell them at a flea market because there are tags on them.
Any idea of where I should start with these things?