A question about casting resin?

I'm thirteen and I'm going to be getting resin and I have a few questions. Can you you resin with flexible molds? I'm getting EasyCast epoxy resin and the molds are made with Amazing Mold Putty. Will it come out? And also is there any way to.. color the resin? Can I add paint to it or something? Lastly how do I put pictures on it? I've heard you have to use Mod Podge? If you could please answer all my questions that would be awesome! :D Thank you!