Do not mow yet, the sod is not ready for that. You need to stay off of it for a month. That grass is at a much more delicate stage than you might realize. It's only going to be shaggy like that once. You will be mowing that grass for as long as you live there, give it a chance to get started. When i said mow at 1 1/2", i meant that as your final cutting height. The rule of thumb is to take off 1/3 of the leaf blade at a time. Start out mowing as high as you can and then go down one notch on your mower for each subsequent mowing. I'm not talking about those manual, push type of reel mower's, those thing's will wear you out fast. I meant something motorized, but when you see the price's of those thing's you will probably say the rotary type mower will do for now. As long as your blade's are sharp and you mow when it's dry and you mow at 1 1/2" you will be happy with how it look's.