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Since you are barely starting out, you can start by covering the back of the honey comb.
OEM grilles are designed with worst case scenario (towing a trailer, in death valley, up a hill, with ac running). Therefore, typical daily driving, you can get away by covering a lot more of your grill openings.
Each car is different, everybody here learns with trial and error. You can start by blocking off as much as you feel comfortable (maybe start at 80% coverage or so)
If you start to notice your cooling fan comes on a lot more often, then trim your grill block down.
For the front air damn, general rule of thumb is that the air damn should only extend down as low as the lowest part of your under car. If you go lower, you are increasing frontal area, which is bad for fuel economy. Again each car is different, therefore you can play around with different sizes.
Cardboard is a cheap material to test the viability of mods. Then when you are set to make a permanent one, you can use any number of materials (fiber glass, abs plastic, coroplast, lawn edging)
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