I know you don't have access to some of the preformed frames that we do here but it's not impossible to sculpt these shapes yourself from scratch.
My best tip for a beginner would be to practice making small prototypes. Start off with something small and simple like a house for example. Once you've mastered the techniques of shaping and sculpting you will learn by your mistakes and can progress to more shapely things without wasting to much material. .
Hopefully, one day, I'd like to write a book about this stuff but I reckon everyone on here will be retired or in a better place by the time I get round to it
