A plastic tub with a close fitting top filled with damp spagnum moss may help with skin shedding. Cut a hole in the tub just big enough for your Corn and remove any sharp edges, use this in conjunction with your dry hides to widen the snakes options. In common with other snakes a Corn should have about 1 square foot of floor space for every foot of length, where multiple snakes are kept in a single tank this ratio can be reduced slightly. Substrate or flooring is largely a matter of choice. Unprinted newspaper can be bought by the end of the roll very cheaply if you live near a printers, this is ideal, if a little plain.
Kitchen towel is probably the best substrate for young snakes, absorbant, cheap and easily replaced.
Wood shaving make a more aesthetic floor covering but care must be taken over the type. Cedar wood is toxic to snakes, any shavings should be dust extracted to avoid lung infections. It is important not to feed your snake in a tank with wood based substrate, snakes cannot digest the cellulose base of wood and it impacts in the gut causing death eventually. Feeding your Corn Snake should take place in a seperate container to the living quarters. This avoids the snake thinking that something coming into the tank may be food.