On alumimum arrows I like 5" on smaller carbons I prefer 4", both with as much helical as I can get away with.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS

I like the 5" shield cuts left helical for everything.

5" feathers, left offset. Feathers are much more forgiving off of a rest. Any colours you use when mixed with blood are hard to find. So go with something bright to follow the flight at least.

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You can use 3" feathers with no problem if you are using mechanical heads.The feathers are about 5 times lighter than veins and if you are having a weight forward problem the feathers might be the way to go.