The new hides look better - don't worry if it takes him a few days to realize they're there and get comfortable with them.

As for your other questions, feeding etc, you'll probably find he's hungry once he's feeling secure and comfortable ie with the proper hides, temps, and humidity.

Also, DO NOT refreeze a thawed mouse/rat. If he refuses, toss it away, pretend like he ate it, and offer a new item at the next scheduled feeding time. I use a tinfoil baking tray with a towel on the bottom as a feeding tray, because it's easy to clean afterward. (sometimes the rodents sort of...ooze things...)

Hope that helps! I'm a new snake owner too but these forums are awesome for all the advice you'll ever need.