Yes.

Yes, if you want them warm you can heat them before you serve.

Yes

You defently need to refridgerate them or they will go all yucky and the sweet potatoe on the inside will make the pastry on the outside go all soggy.

duh!

yes and yes

A little late but….... my mom never put her sweet potato pies in the fridge. After cooling we’d wrap in waxed paper. I’ve made a few pecan pies, but so long ago, but I don’t think i put those in fridge either. My sister got a pecan pie from Costco. It was so gooooooy, I put in the ridge to make it cuttable. It just stayed a gooey mess. I think they are too big. The regular size one I made, was a good consistency.