old topic. but if you haven’t looked at it yet, smooth-on has some good videos talking about their products. resins come from many manufacturers now and can be dyed, pigmented with loads of different things.
there are a ton of videos surrounding Sculpey. They even have some videos of their on their site and social media. most of it is just practice and becoming familiar with how the clay moves when it’s warm, cold, with a tool… keep at it!