Alright, don't take this as me being a ****, because it's not meant that way. This is meant as constructive criticism.
First off, you're asking questions that five minutes on Google can answer. In order to get useful help, you shouldn't be asking people to spoon feed you answers to basic questions. Instead you should be asking if there are any resources people would recommend, doing your own research, come up with specific questions that you can't find answers to in the course of your research, and then ask if specific questions to those issues that arise in your experimentation and research. These are basic research skills that you should have been taught starting in 5th grade or so. I know spoon feeding is easier and I've even taught college students who only wanted to be spoon fed, but you learn nothing from being spoon fed. Instead, you learn from doing your own research and doing your own experiments and asking specific questions that arise from your own work.
If this is something you are serious about, you need to put in the legwork to get the basics down, then come back with specific questions about the intricacies that arise. This is particularly important since everyone has a different experience with casting, so one person's techniques and products they use may not work well for you.
Secondly, since I'm assuming that you plan on turning this into something that you can make money off of, it's not fair to ask people to freely give you their knowledge. This is especially true in light of the fact that most of those people have invested plenty of time and their own money into finding answers, often a considerable amount of money. Unless there is reciprocity through sharing of information or contractual promises of repayment, you really shouldn't expect people to give their knowledge up for free.
That's not to say that people won't give you some of the basics, after all Binge has graciously made a guide that he has in his thread in here and I've done some write ups, but you really can't expect them to sit down and guide you through how to do it for free if you plan on selling the caps.