It looks like a leopard gecko for sure, they can be handled (gently) but since he was running around "wild" he probably isnt used to people. I hear the sand issue a lot, you can use papertowels but it doesnt look too nice, maybe try some of that reptile carpet if you want. I don't think the wood bark is a good substrate because these are from the sand/desert so it may not be too ideal. A heating pad isn't needed if you get a good heat lamp for it, that should keep him warm enough. Buy him some crickets gutload them and dust them first with some calcium supplement, keep the water clean and make sure that it has a hiding spot(they hide/sleep A LOT!) Also I hear issues about needing humidity for shedding their skin, make sure to make a small container like a butter tub or something with a hole in it and some wet paper towels to have a little "sauna" to help him shed, then he will eat the skin! Good luck, these are really good pets and all the stuff you need will be pretty cheap, make sure you get a light/lamp!
