burley can be the premade pellets that you throw in on a regular basis. I like to create my own with pollard, lots of tuna oil, water, and bits of fish. When the fish are around you must keep throwing it in to keep them there while you fish. If you put it in a good burley bucket and hang it over the side it should do it for you. 

What I do,keep a container in the kitchen to put old oil in from cooking,fish heads from old trips get choped up in a old blender I have along with breadcrums.I have got two plastic  containers (witch are the ones that pool chlorine tablets come in )That all gets mixed up and put in the freezer a third container I have Put holes in as a burley cage, in the same container (type) the frozen chum ball comes out of the freezer and fits strait into the cage as it defrosts it slowly releses the burley .This process is only done on anchor,in the case of drifting you would first find a spot that has potential when you would cube mullies slowly on the first drift then do a second drift and se if anything changed then do a third drift cubing again if the activity did'nt  improve .