You JUST got one? Well, congrats. [:D]
It really depends on what you want to do with those metals. Over the years I have slowly built up my Dremel accessories to include:
carbide cutters
fiberglass reinforced cut off wheels
flap wheels, drums, and discs for sanding
both silicon carbide and aluminum oxide grinding wheels
buffing wheels
and more
If you can pick these things up at swap-meets or similar places, do so. I live in southern CA, and sometimes go to the Pomona car show/swap meet (supposedly the west coast's biggest and baddest[:O]) and always find these things at WAY below what they cost in stores. The above list has served me well for anything that can be done with a Dremel tool. Check out this web site:
[url]http://www.dxmarket.com/micromark/dir/1.html[/url]
This site will give you an idea of what is out there. I wouldn't buy anything from there unless I had to since, like I said, these accessories cost WAY too much... HTH