I recently purchased a house in the suburbs with a lawn. I lived all of my life but the past few years in the city so i don't have any idea

on how to take care of a lawn. The lawn is in pretty good shape from what i can tell there are a bunch of holes that need to be leveled and a few other minor problems like dandy lions and brown patch's and a few bare patch's where there is nothing growing. Whats the best method to start fixing the brown spots and bare spots? Do i fertilize and then sprinkle grass seed on those problem areas? All the effected areas are in the sun for 4 + hours a day. Any informations would be greatly appreciated.
Thanks.