Congratulations on your new Corn. As Amanda said, rattling is common. I have a Rat Snake that Rattles quite a bit. As for the restlessness, I could not tell if you meant in the enclosure or in your hands. If you meant in your hands, most snakes will continually move while handled, won't just sit there still. One exception being Ball Pythons which will sometimes just sit still. All of the Corns I've ever had moved continuously while being held. That's normal. I have alot of snakes, so not much time to just play with them, but I feed out of the enclosure. So each of them are handled at least once a week to get them out of their enclosures and into the feeding tubs. They all stay "tame" with this minimal amount of handling. An active snake in the cage could mean a few things. First, it's a new environment and he is exploring and trying to find hiding places and whatnot. Second, he may be hungry. Third, as mentioned above, the temps could be off and he's trying to find a place that is warmer or cooler. I would check your temps to be sure he has appropriate warm and cool temps, and he should have an adequate hide. If you bed in nice deep Aspen, the whole enclosure will be a hide which is nice. Have fun with your new Snake!
"Mysty"

"Suezo"

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Lyns Lair
WNY Herpetological Society
0.1 Cat (Mia)
4.2 Ferrets (Wolf, Shadow, Verdell, Sullivan, Boo, Peach)
2.0 Rats (Inky & Oy)
1.0 Carpet Python (Bear)
1.0 Malagasy Blonde Hognose (Wilbur)
1.0 Malagasy Giant Hognose (coming soon)
1.0 Yellow/Everglades Rat Snake (Pumpkin)
1.0 Russian Sand Boa (Fang)
0.1 Normal Corn Snake (Mysty)
1.0 Anery Corn Snake (Suezo)
0.0.3 Eastern Milk Snakes (Uno, Dos, Tres)
1.0 Ball Python (Slytherin)
2.0 Smooth Green Snakes (no names yet)
0.1 Golden Greek Tortoise (Sunshine)
0.2 Mississippi Mud Turtles (Squirt & Shyanne)
1.0 Green Iguana (Norbert)
1.0 Bearded Dragon (Moose)
0.0.1 Mountain Horned Dragon (Tiramasu)
0.1 Oustalets Chameleon (Cera) coming soon
1.0 Whites Tree Frog (Trevor)
2.0 Solomon Island Eyelash Frogs (Chompy & Gimli)
0.1 American Toad (Bump)
1.0 AFT Gecko (Cocoa)
5.5 Leopard Geckos (Trouble, Scooter, Simba, Firenze, Teddy, Mystique, Freckles, Dotty, Zipper, Twister)