Welcome to YT
and congrats on your new pup...can't wait to see some pics! I can't offer you any advice on the shaking I'm afraid, he must just be nervous of new surroundings. It might be a good idea, as has been suggested, to have some nutrocal on hand just in case. I've read in threads about little ones suffering from hypoglaecemia (spellling?) if they're not keeping food in their bellies, and I think shaking is one of the signs - don't want to worry u though, I'm sure all is fine!
Wishing you all the best, I hope u enjoy your new baby! xxx xxx