How to care for my baby gecko?

i just bought a baby gecko from petco today. i have a 10g cage and a dish for water and a dish for mealworms. the lady gave me a heat lamp that is attached to the top of the cage with a 75watt bulb. she said that we needed sand so we bought gecko sand and lined the bottom of the cage with it. inside the cage we have a thermometer to make sure its getting the heat it needs. we were told to fead it about 5-10 mealworms and 1-3 crickets once a day. am i doning anything wrong and do i need anything else? alos they were out of little homes for it so for now we have a half of a plastic container that it can hide in. thanks :)