Pretty much everything Nile Man said
Looks like you have an Ornate! "Varanus Ornatus"
Buy this book!
http://www.amazon.com/Nile-Monitors-.../dp/0764116401
It has everything you need to know about Ornate Nile Monitors.
In the meantime, here are some quick tips!
"Our Ornate Nine Monitor Feeding Schedule"
Monday - White Meat (or fresh seafood)
Wednesday - Red Meat (beef, buffalo)
Friday - Whole Prey (farm raised Rodents and Birds)
Sat, Sun, Mealworms, Crickets and Roaches
And you can give him whole little quail eggs if you can find them for treats!
Remember not to over feed him, and make sure he gets exercise!
For a lamp you will need a 100 - 150 watt Basking Spot Lamp. ($25 for the fixture, 10 for the bulb) Place the lamp around 2, 2.5 feet away from his basking platform (whatever it may be). Niles like to rest on things when they bask like a pillow. <--- see my avatar
Place your hand under the lamp and rest it on the platform. Make sure it is hot but not too hot that it burns your hand.
He will want to bask at the time of day when the sun is at 45 degrees morning and evening.
Provide fresh filtered water at all times.
Obtain some chlorine remover from your local fish or pet store that will make tap water "safer" and you can give him bath time.
I actually trained one of mine to go potty in the shower when the water is running so give it a try. Warm water stimulates their digestive system so it get's them in the habit of using that area of the house instead of your living room floor
Get rid of the hotrock and use a heat blanket for his bed. Make a cardboard castle for now, he needs to sleep in a cave eventually. You can build one out of wood like a smaller doghouse, but make the hole just bigger then his diameter. They love to lurk.
Playtime is a great idea. Niles are usually very aggressive and hostile, but you can successfully train them if you put the effort and time in. But seriously get that book, it has a LOT of good information on your pet dinosaur