I've found that Pferd brand files are good and you can find them on amazon. Get at least a 10" bastard cut. I have a 14" one that I got on amazon that's just about as good as my nos nicholson. The thing I learned about files is that technique is more important than the quality of the file. Files cut in one direction. Don't apply pressure on the back stroke or you will dull the file by breaking the teeth. Store them like you would any cutting tool, that is to say, don't throw them in a drawer and let them bang around against other tools or they will get dull quickly.
There are a lot of suitable epoxies for knife making. I use acraglass based off the recommendation of several other knife makers. Once again, though, technique is more important than brand or type. All surfaces to be glued should pre-fit so that there are no gaps. If it is a hidden tang knife than the tang should have notches for the epoxy to grab and if it is a full tang there should be holes drilled though or a scallop ground down the center. And most importantly, the tang should be degreased with acetone or denatured alcohol and then not touched with your bare hands before you glue up the handle.