Well, for FX supply, these are the places to start:
A list of instructions for various materials:
http://www.fxsupply.com/print_shop/p...p.html#catalog
And the price lists are here:
http://www.fxsupply.com/pl/pl.html
Sounds like you are most interested in the Instructional video:
http://www.fxsupply.com/pl/pl_docs/video.pdf
And Books:
http://www.fxsupply.com/pl/pl_docs/books.pdf
Then you would order by the instructions here:
http://www.fxsupply.com/connecting/order.html
But, for just simple molds, there's a bunch of online instructions free of charge.
This is the source for molding latex I use, and it has an instruction section:
http://www.delviesplastics.com/mold_builder.htm
The first tutorial I used to start making skulls is here:
http://wolfstone.halloweenhost.com/C...terSkulls.html
I since bought the mold makers handbook from FXSupply above.
I use the same general method there for a number of different molds now, though I've refined it a bit, and get more details from my molds, have exact dry times between layers, and a whole different coloring methodology.
And, my son is going to be making some small molds for a school project under my guidance, and casting them in both resin and plaster. I would be willing to do a detailed step by step for you if you're still uncomfortable. (since it's much easier to do a step by step and get the pictures when it's not your hands getting all ookie) I will also be making molds of the Lindberg skull once mine arrives and could get a bunch of pics from that process to show you larger ones. Might even be convinced to make a 2 piece mold.