Honestly, don't over think it. Just start marking every single email you know is spam as spam. Occasionally check the spam box and un-spam anything legit. The f

Honestly, don't over think it. Just start marking every single email you know is spam as spam. Occasionally check the spam box and un-spam anything legit. The filters on gmail are really, really good and they learn quickly what to filter and what not. Don't do anything weird or complicated, just hit the spam button.