Aaron,

   Check these videos out from Our resident ModelMadMan ! He has a set of Awesome Videos !!

  http://www.youtube.com/user/ScaleModelMadman 

    I agree with Cap. There are some basic steps in Weathering. The order will vary with each modeler. Case in Point -  I apply My pin wash first. Dry brush,Weather with Mud & Dirt, Dulcote, apply pigments to dust up. At the same time, it depends on what you model. I model Armor , German Armor more specifically,and it's almost like, each Genere has a certain style. 

  Feel Free to reel off the Questions. That's why We're all here !! trade Ideas & Scrape Plastic !!