There are many videos on YouTube that will help you make the mouse - and probably the shoes. Check out not only cake decorating videos but polymer clay ones. The technique is exactly the same - only difference is that you would use gumpast &/or fondant instead of clay.
Donna Lane shows us how to make a fondant mouse.
http://sdcakes.com/forum/viewtopic.php?f=7&t=83
Donna Lane removed the clips. Any other suggestions? Would love to know as well. 
Personally, I would make the mouse's head first from white gumpaste. Impale the head onto the top of a short skewer or 18G wire with as loop at the top. Place into a drying stand and leave one week. Paint features as soon as its surface is dry.
Make the shoes - gumpaste again (pink if desired, though I normally colour after moulding). Leave to dry at least 24 hours.
To make the rest of the mouse, wait until the head has dried and keep inserted into your 'oasis' or other drying stand. Mould the mouse body, attach the pink dress (made of very thin GP) then add the white arms from the shoulders into the lap.
When ready to place on finished cake, remove mouse body with head from stand and poke directly into cake or straw/posy pick. Add skinny legs in white GP from under skirt into shoes. Add tail.
Thats how I would manage it, but I am sure there are plenty other methods!
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