What Jade wrote is excellent.
You should honestly leave him be for about five to seven days, because being moved from one environment to the next is very stressful! Just be sure to give him fresh pellets, hay and water daily. Bedding should be changed about one to two times a week, depending on how soiled it does indeed become. After the adjustment period, slowly introduce yourself to the chin. That way he can get use to your scent.
Dustbaths should be one to two times a week, more during the humid months.
Chins love treats! But give in moderation, too many can cause obesity and illness in chinchillas.
And most of all, give him plenty of love! Chins are very social creatures and one of my furry babies gives me kisses on my mouth. We are very bonded.
Enjoy your new baby! And pictures are a must!