Help with fairly basic irrigation system
Usually sprinkler systems are on a second water meter so that they are billed at lower rates than water used in the house. A municipality approved anti-siphon/backflow valve will be required and may cost a couple hundred  dollars. Very likely you will need a diagram for approval and a final inspection when finished. Pick a pipe size and stay with it ; I put in my own system and used both 1/2 and 3/4 pipe . So when I make repairs, I need two sizes of parts, inconvenient.