Is this too heavy for making and folding envelopes?

This would be a good weight for making envelopes.

Do you have a Ivory or Cream color paper? I do not see it when I click on the color options. If so, is it like regular copy paper? I want to use it in my cards because you can't see the writing very well on the colored cardstock so I want a cream or ivory to match with some of my warmer color cardstock such as cherry cobbler, old olive and crumb cake colors by Stampin'Up. Thanks

If you are wanting just a paper weight and not a card stock weight, we would recommend this paper in the Natural White Color and we would also recommend the Cougar Natural Paper.  It is a bit heavier than copy paper which is about a 20/50 lb weight.  But it is still paper weight.

Is the deckle edge on the 8.5" side or the 11" side?

This particular paper does not have a deckle on any of it's edges.
Our Teton Deckled Edge Card Stock and Paper has a deckle on the 8.5 inch side.