Below is a link to a downloadable PDF file that goes into different aspects RELATED to pen making. It is not about "How" in pen making, turning or casting, but it is an overview of the things beyond the absolute basics, including tools, finishes, and methods. It is a little long and has a few mistakes that will hopefully get cleaned up soon.
check the forums in "casting and stabilization" over the last 30 days or so. You will find links from threads on modifying a pressure tank. search "pressure pot" and you find answers to questions that I asked. with links and instructions in the thread. check out you-tube. grub32 has some good videos. I just got all my stuff too. I have used a gallon of PR in like 2 days, and I'm so fricken high, I can't see staight. CASTING IS AWSOME!!