What is the easiest way to make resin molds?

I would like to start making resin crafts/ornaments, etc. What are the best products for a beginner to start with? I am confused as to what I should use to make my molds because I would like to be able to paint my finished products. Also, are there different kinds of Resin, if so which type do you recommend for me? Do you have to use special paints on resin? What type of Release agent is the best? Should I use a sealer on my finished painted products?