I know I’m behind the 8-ball with Gmail use. Reason being, I prefer a client-side (runs on my computer) email application, but my trusted friend Eudora is not ever going to work with Mavericks, so I have to make a switch. I’m using Gmail while I choose a new app and learn how to convert Eudora emails over to it without losing the valuable data associated with it (like, dates, for instance).
Found this good tutorial on setting up Gmail filters. It’s well written, easy to understand and has graphics that assist with that. Maybe you’ll like it too. Or when you’re reading an email, use the more pulldown menu option “filter messages like this” to get to step 1 of the setup process.