Sounds like the rock is already cured if it's been in the other tank for a few weeks or longer. As far as the amount of rock needed, the recommendation is 1 1/2 lb per gallon, so about 20 lbs would do. That will provide enough natural filtration in your 14g.
Water looks great, just don't forget the water changes on a reg basis for the best results.
I would prob wait another week on the shrimp. If params stay like you posted above, then you should be plenty safe to add a shrimp or two.
Keep in mind that the algea blooms haven't started yet. 1st will prob be a brown algea called diatoms, then a green algea, maybe hair algea or similiar. Prob a perfect time to add some snails would be when the first algea bloom occurs. This will give them something to feed on.
That should keep you going for a few more weeks.