Ask the pet store whether they were feeding live, f/t, or p/k and what size mouse or rat was being offered that this snake was supposedly eating (be aware pet store often exaggerate a snake's feeding response). Try a search here on feeding for lots of ideas to help settle the snake in. Stressed snakes simply do not often feed well so it's important to get the snake settled in and feeling safe and secure before it will likely eat for you. The newspaper trick is very handy and often helps with that. Pick an evening that will work for you, offer once per week in the evening hours and do not leave the snake alone with a live prey item that has fully erupted teeth. You can lower the lights and remain nearby to monitor the live feeding but do not hover over the enclosure or move about a lot as this will disturb some snakes enough to cause them to refuse. If the snake is used to f/t or p/k then of course you can leave it alone with it's prey to feed in total privacy. Make sure whatever type of rodent you use, you are picking a size that is correct for this snake. Compare the largest girth of the prey item (it's hips and butt area) with the largest empty girth of the snake and make sure the prey is smaller than the snake's girth. If in doubt go smaller (though a pinky mouse is too small so too small can be an issue as much as too big).