My personality is a desire to know and learn things. Even to make fun of people I like to learn things about them.
Eventually this leads to knowing everything I can about a character. Someone says something I don't know? Time to read comics. I like to know the whys and hows of this thing. Of course this has its limits because some things I don't care about, and just won't learn about it.
For characters I actually like, I'll read them in full. Anything I learn now about comics is from newer ones or from someone saying something interesting in a debate. I learn everything I can about that going as far back as I need to, even if I don't post about it ever.
How I got started is from me only knowing about the cartoons and very few comics and old Marvel Cards. I found this forum after buying some of the Galactus Marvel Legends wave and lurked it years or at least a year before joining. Superman Prime, Tyrant, Galactus, Thanos, etc. You join, learn minute bits of info from others, and then start investigating on your own once you learn how to download comics. Eventually you learn Long Pig is a filthy liar, and so on.
Anyway, my advice would be to pick a comic and read it. Doesn't matter where. If someone recommends something that appears like something you might like and is short enough (if length's a shortcoming), check it out. No matter how accurate a summary or review is, they can never capture the feeling and context of the actual comic. You like a character? Read about them. If something sounds interesting to you on the forum, ask for an issue number or what you should read to get the full scope.
Throw out a character or two and I'm sure people will be more than willing to give you some stories involving them.
Also comicbook db is a Godsend for some characters.