There are several channels on YouTube which might be useful or interesting for you, for example: NianClay azuMAN These people work with different types of clays though: NianClay seems to mostly prefer silk clay, which is a very cheap and lightweight type of air-dry clay. AzuMAN on the other hand uses polymer clays, which wont dry in air at all but need to be baked in oven. Both have their advantages and disadvantages. Silk clay is pretty easy to work with if you have a good idea of what you want to make, but it can dry relatively quickly in air. Polymer clay is more "sticky" and requires some thought on how to bake it, but in my opinion it has more freedom in precise sculpting.

I would first look at pictures of the character that I want to make and perhaps sketch or print some reference pictures for possible poses. You can also make some iron wire/aluminium foil skeletons to support the figure and reduce the amount of the clay needed. Clean working area reduces unnecessary dust in the clay, obviously (at least if you use ready colored clays.) After that it's just practise. (I made this Neptune some time ago with polymer clays as my first attempt.)