you already have a great anchor. you need about 6' to 8' of 3/8 chain attached to the anchor. then you need to let out enough rope to let the anchor do its job. you need to let out at least 3 times the depth of the water your fishing, and more in rough water.

I have 300' of 5/16 rope wound up on one of those extension cord spools that you can get at places like lowes, its a great way to store your rope. if I'm on erie in 50' of water I let out about 150' to 200', and even more if the water is very rough.