What kind of glue is best?

You usually only need one or the other. Really it's whatever you like. I personally like primer better, but it is up to you. Try both and see which one...

Using a low-tack adhesive works perfectly if you want to be able to reposition the fabric before setting it.

Gorilla Glue works best for the cracks. Be sure to get the clear glue, otherwise you will have yellow all over the lens.

A good quality regular super glue, or better yet, a gel glue like Loc-Tite. Tiger glue is also good quality.

Yes, but it's not really worth it since you will be adding shaving cream. The lotion, shaving cream, and foaming hand wash will make the glue look white, instead of...

You can use clear glue, or any type of liquid craft glue. If you use a glue stick you will have to microwave it.

Use a good glue stick as that won't seep through the page and ruin your drawing (it doesn't wet the page like liquid).

Paralysis, and prolonged exposure (especially to the neck or heart) can kill. You could incapacitate someone, but if not careful, could outright kill or permanently paralyze.

Use a special spray adhesive for interior carpet that is available online or in stores.