Brake In Period(Reverse)/Tires

I’m new to this forum and to ATV’s at age 59, so please bear with me. I got this new ATV Friday, have had a ball of my life riding it around my 6 acres and into the woods. But today we had a bad storm in which some tree limbs came down (large). So needed the ATV to pull some tree limbs about 1/4 mile to dump them into a large wooded area. with the winch. Did I hurt the ATV?

Second question, do know if I have a slow leaker (stock tires from store) or what, but been looking at tires for my ATV. Question: Where is the best place to get good tires and I don’t do any mudding (no mud here in SC).