And what specificalyl do you have problems with?
ahm... i am new with AE and can't figure out out to do it...
You would simply animate the text layer by whatever means (keyframes, simulation plug-ins like Newton) and then create the dust puffs using stock footage, particle systems or whatever, placed and keyframed to match the timing. anyway, simply watch some tutorials. Video CoPilot has all sorts of such stuff and I'm sure you can find enough otehr tutorials based on the quick keywords i gave you.