How much glue for each stone?
You will use smaller spots of glue with smaller stones, larger with larger. Practice with each size stone you use. Do not apply any more spots of glue than you can set stones into within 60 seconds. If it is a dry day, do fewer at one time. You do not want the glue to skim dry on the surface BEFORE the stone is set. I usually do about 1 inch at a time.