Well, none of that (outside of a fondness of Marvel in general and wanting to see a good Spider-man on the screen) has much to do with Marvel's Cinematic Universe (X-Men movie rights are with Fox and have nothing to do with Avengers connected movies).
But I can provide you with a list of dozens of hours worth of movies and 100's(?) of hours of TV/Netflix to watch to familiarize yourself with the MCU side of things. Then you'll have plenty to contribute to Marvel's $10 Billion Franchise called the MCU.
edit:
It's official!! With the release of Civil War, the MCU has crossed $10B WW in the theaters.
http://www.boxofficemojo.com/franchises/chart/?id=avengers.htmCivil War itself will cross $1B WW next week (currently at ~$950M WW).
and Disney as a whole just took the record for fastest to $1B in domestic gross from Universal w/ just 128 days in 2016 to get there. The movies that contributed most to that were Zootopia, Junglebook & Captain America: CW (Star Wars: TFA apparently counts for it's 2015 release).
http://www.boxofficemojo.com/news/?id=4184&p=.htmCurrent Grosses Dom / WW:
Civil War- $296M / $940M
Zootopia - $332M / $970M
The Jungle Book - $312M / $828M
and all 3 are still in the Top 6 in theaters, and all 3 are projected to cross $1B dollars each.
Zootopia and The Jungle Book are far above expectations, with Zootopia having some amazing legs consistently seeing a rise in the charts after a drop. New movies come, and then Zootopia sticks around long enough to watch them leave.