I love this form of embroidery - and you can see the effect very quickly. What type of articles are you interested in making ? I've used little flower pictures to make gift cards, having padded the flowers into a cut-out card - looks very good.
I use dupion silk [?] for most of my projects and YLI silk ribbon and chenille needles, according to the width of ribbon, all of which you should be able to find on the net.
I'll check back and see how you get on - good luck skz
ps I'm just taking up Mountmellick embroidery, teaching myself from a book which should be fun !!