For proper shallow fishing a generic rig for me would consist of 0.15 hooklength with a size 16 fox 2 plus a small dibber of some sort or a polyball if really shallow. i prefer to use no weight down the line and if you can, use a float so small that the pellet sinks it and use the buoyancy to slow the fall of the pellet for the last few inches.
I’ve also had success with double hair rigged pellet, with the first one on the hair being a floater to slow the fall down again.
As for elastics, I’d think that double solid 8, 13H or Grey Hydro would be fine unless there are quite a few of the larger fish around in which case go up one size.