i want to get into comics

so i am a huge fan of marvel cartoons and live action movies and now i want to read the comics. for the most part i do not want to read comics that are too old/inconsequential to the modern spider-man comics, though i am not sure how to quantify what to old is since i know pretty much nothing about comics!

i know spider-man is relatively old and vast but he is my favorite stand alone superhero of all, what issue/series do i need to read in order to catch up with the most modern incarnation of spider-man comics and have all of the necessary knowledge to continue reading spider-man for the foreseeable future?

from seeing the various incarnations of characters in the different spider-man movies and cartoons (mostly the marvel's ultimate spider-man but also some older series), along with reading snippets of comic book info on different wikis/articles over the years, there are a few characters i would like to specifically learn and read about!

so just in case they are not in the main comics i have to read in order to catch up with modern spider-man comics, what do i have to read in order to learn more about agent venom, the iron spider, the scarlet spider, carnage and spider girl/spider woman.

i also know from the ultimate spider-man that spider-man worked with a group called the new warriors including but not limited to power-man, iron fist, white tiger and nova. sticking to the same idea as with spider-man where i only want to read relevant comics that can get me to the most modern form of each character, so what issues should i start with?

i think that is it for now because it will probably take many years and much money to acquire and read all of this material!