New home owner here…I was actually in Home Depot today looking to buy a mower and get a rake to start clean up and the woman who helped me said wait until the grass is growing and it’s somewhat longer than you want before you cut it for the first time in the spring. Also, mulch the leaves (depending on coverage) in the first cut. Otherwise you risk drying out the grass before it’s ready to grow and thrive in its own. Sounds reasonable, but I’m a noob.