How to make rubber molds

I want to make my own shoe inserts (due to funny feet).
What is the easiest best way to do this? Should I use some kind of
plaster paris mold and what material is available to fill the mold and
produce the final insert. I am a newby at this so please tell me all.
Any links on how to do this much appreciated or helpful replies.
Thanks.
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Anonymous Remailer (austria)

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