Go on YouTube and type in - how to slip bobber for crappie
It works great for Bluegills also. I have been Slip Bobbering for Bluegills this year with great success.
My suggestion is go with 4lb test line and you will get more hits. I actually use a small swivel and tie it to the 4lb line then on the other end of the swivel I tie 3ft of 2lb line. This way if you snag the 2lb line breaks and you still have the swivel and slip bobber. Just put 3ft of new 2lb line on. I also use #8 Aberdeen hooks I buy on Ebay in packs of 100.
Recently the bigger Bluegills I have got are in 12ft/18ft of water and I set my Slip Bobber Stop Knot at about 9ft(So I'm fishing 9ft down)
Best bait for them(My choice)is mealworms or crickets