Footer makes a good point. Outside of that if you really want to get involved with some pro prop replicators there's always the RPF, they tend to focus on movie and tv replicas but there is a ton of talent and lots of tutorials and walkthroughs on their site. So it depends really on what you want to do. Tutorials for specific props seems to focused but techniques like how to make molds or build a Vacuformer would probably be great.