Either church or off shore boards will work for you. If you are going to be hooking them to braid line you will want to invest in some heavy grip clips so they don't slip.
Riggers will allow you to hug to bottom and know exactly where you lures are. If you get a rigger that will handle 10# balls you can tip your transducer up a click or 2 and see where the balls are running on your graph too.
Another option besides riggers is a "pump handle" basically its a 3-way rig with a 1-2# drop weight. Just be cautious bumping bottom too much some places are pretty snaggy and some are not. But there is only one way to learn...
You definitely do not need riggers for early season, some days I don't even deploy mine and run all flat lines or 1 to 3 colors of leadcore is all the deeper I will fish.
Dipseys will put fish in the boat but I have found that riggers will outperform them overall, but definitely have their days they beat the riggers.
As you fish the lake more you will learn ways to target different levels of the water column and spread those presentations wide to cover water.
But keep in mind, just because you are running riggers deep out of Duluth in June does not mean you need to be that deep in Silver Bay in June and so on. It is all about vertical water temp when playing a numbers game.
One great resource is www.glangler.com
for more info on fishing big water.