Hi Welcome to the forums and congratulations on your new frog!

In regards to your questions, I would suggest Eco Earth ( coco husk ) and I would do a basic clean everyday. You want to make sure and pull out any poops, cricket parts, and give them some fresh water. Then I would do a full clean of the substrate and a good wash out about once a month.

With feeding that depends on his or her size. I would suggest feeding once a day to start so you can get a general idea for the minimum amount they will eat. What I did with mine is throw a good amount of crickets in and then wait about 24hrs and count how many they ate. Used that as a base amount and then adjusted the amount on their left overs and if they look a healthy weight.

Another thing a lot of people do is let them eat as much as they want in a 15 minute period. You could do that and then adjust it based on if they are looking to thin or obese.

Having a thermometer and hygrometer is important to always have especially if you don't have a room that the temperature and humidity is controlled. That way you can make sure their environment is the best you can provide for them at all times.

To provide good heat you can always use a heat mat or a low wattage day and night bulb. For humidity spray down their habitat with treated water a few times a day and provide a water dish for them to soak in if they want.

Would love to see images of your pacman if you have any and I hope this helps you out a bit.