I use the following rig for my grub fishing. 6lbs P-Line CXX mainline ->1/2oz sliding egg sinker->small bead->small ball bearing swivel->about 20" of 6lbs flourocarbon leader->size 8 Owner mosquito hook.

I like the 1/2 oz for the extra distance (if needed) and to keep the rig on the bottom when there is surf. A quality swivel is important to keep the leader from tangling up on your swivel. Some people like to use long leaders in the surf but I find it difficult to manage. I get too many knots and twists all over the place. Around 20" seems to work the best for me. I've caught fish on leaders that are 7" long. Good luck!

Tom