A new roof is a big investment and should be taken care of to prevent possible damage that can occur from lack of maintenance. Also most insurance companies will not honor a claim if they feel any damage came from lack of maintenance, so protect your investment. First make sure to clean your gutters at least once a year as debris such as leaves, pine needles, or tree branches can build up and block your downspouts. This can cause water to pool causing damage to wood, landscaping, your foundation, or ice damming. You could consider installing gutter guards which will prevent debris from accumulating in your gutters. Second trim back trees and other vegetation hanging over your roof. This will assist in preventing leaves and twigs from landing on the roof. Third, have your roof inspected by a roofing company once a year as they can look for any problems that may need to be addressed.