This is all shown on Casting Metals on You Tube.So I hope there are no objections for showing this here. These pictures from the Prince August Web Site,fully explain how it is done. You can shop around for cheaper metals on the Internet. ( I advise that you do not melt Lead!) Moulds sold are in 25mm, 28mm,32mm,40,mm,and 54mm scale.
Perfectly Legal,but don`t sell them or give them away they are fully protected by copyright law
( Piracy Act ) precedent has already been set down in the law court of Germany,Great Britain,America and elsewhwere, on violation of copyright.