i have 10 of the 5.25 stick molds myself. very easy to shoot, even laminates with the 2 colour injectors. if you plan on getting more than one you're going to want the large injector. the med can only fill a single mold, large can fill 3.
plastic, salt etc is all personal preference. for colours see the recipe thread, lots of good ones in there. for sticks i will use 4 parts plastic, 2 parts salt, 1 part softener, so 1 cup soft plastic, 1/2 cup salt, 1/4 cup softener