The .pcf files go in your /tf/particles folder.
As per "pakrating",
Pakrat is a program used to pack custom content into a map. Whenever you include content (textures, props, particles, etc) that aren't included in TF2 by default, you need to pack this content into your map for other players to see it. Pakrat is just one of a few programs that can do this. IMO the best option for this is
CompilePal, which not only packs custom content, but also runs the Valve Hammer compile tools and includes a bunch of features that streamline the process of compiling your map.