As stated read thru some tutorials and go to the right forum and you will learn a ton of stuff.
As far as sheaths go you usually (IMHO) want to stay away from chrome tanned leather. I am sure with stainless and what not its not as big a deal but with simpler steels you can get into corrosion issues. Still as long as you dont leave your knife in the sheath you may be alright. If its going to be going thru hell then I would recommend some vegtan leather of some kind.
As far as glue I use weldwood, you can find it at lowes and home depot and a number of other places. Put a thin coat on each side you want glued together and let it get tacky then press them together. Clamp them or use weight to hold it for a while. Stitch it up which gives you your strength. The glue primarily keeps the edge together after stitching which keeps it looking nice, holds it to make it easier to stitch, and thats about it.