Hi! I am going to install a stone bench and fountain in the back of my house over the summer. I am thinking of using flagstone as a path to the fountain and bench. I was wondering what is the proper material to use under the flagstone to make sure they do not wobble. Also, I was thinking of using a type of pea gravel to fill in between the flagstone to make everything level and look nice. I just don't want everything to become muddy after it rains. Thanks for the help in advance!