nice...
good luck with your snake.
pinkie mice - well, it depends, are you offering your snake live or frozen food? if live just place it in the feeding container and let the snake go for it when it's ready, if frozen thaw out the mouse before giving it to the snake. you can either let it set out at room temperature for a couple hours or put it in a bag and run it under warm water for a few minutes.
it is okay to use tap water, but i usually keep a bottle of spring water handy because water in my area is pretty bad, chemically disgusting. if you drink the tap water then your snake will be fine with it.
if you got the snake today i would wait three days before handling it so that it has time to acclimate to it's new environment. if you got it from a store you can probably handle it tomorrow because it didn't travel as far and won't likely be as stressed out. i got my first snake from a store and immediately began handling it and it was fine, but i've since learned that it's good to give it a little time to adjust. you don't want to stress the little guy out too much. it will continue to be a little nervous when you go to pick it up until it gets used to your scent and it's new home. my hatchling has just now begun to calm down and i've had him since november...but he escaped for three months in january, haha. you should wait at least 48 hours after it's eaten before handling it so that it has plenty of time to digest it's meal.