body work?

hey whats up
im gona be grinding down some rust spots and filling them on thursday. i have never done body work before so i have a couple of questions. i did a search and it answered a few questions but not all of them. i am gona be useing an angle grinder to grind down the spots, a couple of the spots are a little on the big side so they arent little specks

  1. what is the process of grinding out the spots?
  2. when i did a search i read not to use bondo but it didnt say what to use, so what do i use for body filler?
  3. what are the steps of useing body filler( like how to apply and what to sand with and all that)?
  4. do i need to wet sand and how do i do that?
    i think thats it , any other tips or info would be greatly apreciated.
    sorry about the questions
    thanks
    later
    mike

does anyone know