Keep it simple...
And we pretty much all do this when we are learning to Navigate, we think we need everything including the kitchen with us.
I use the CASA A5 knee pad with my flight plan on that, or just a piece of paper you can write flight numbers on, aircraft call signs, radio frequencies etc... Fuel management, i.e. left/right tank times. It's where you scribble things down, and that's the beauty about the backing board of a knee pad. I sometimes have another A4 clip board with maps on it if I'm going on a long trip just to keep them from getting lost, but normally I just have the map to my side or on the floor (depends on the aircraft of course) and if I need to, or want to clip it under the clip on the knee board you can do so.
Tell you a story...
I used to have the habit of map reading every 10 seconds or less, in other words I was constantly trying to make sure I was on track and effectively 'over' navigating. It was pointed out to me one day when I was flying with a very experienced pilot, and instructor. He said something to the effect; "when you're driving on a road with a road map on your lap, do you keep looking at the map even when you're on a straight road and you know you have to go 20klm along it to the next turn off?" My answer... "of course not!"
6 min markers, or 10 mile - whatever floats your boat are there to save you from over loading yourself for no reason. If you're on heading, and you just went over your last landmark and put the time down the map, put the map down and look outside, enjoy yourself! Watch that heading, keep and eye on the clock and look outside.
Have fun, don't get lost and leave the kitchen sink at home.