Moldmaking How to mold?

Hello fellow colleagues,

I have a very important question about mold making.
The mold itself is the whole problem for me.

I have NO idea how to put my clay parts and such that it would make the best mold for me to cast in.
Can someone please, with experience, put on a tutorial or something with pictures for me to follow?

I'm at my wits end.... and I really want to cast my first doll thats done

 

Thanks for all the words to look for

 

Thanks aneemal, that's what I needed