Residential Services or from the application on Buy Nook Miles Ticket your phone. 

Remember - you'll have to believe that these things will appear and you can simply demand five things from Nook Shopping at a time, so make sure you plan your purchases circumspectly. 

At whatever point you've gotten your lines, place both of them in different territories across your island. 

If you like visiting other player's islands, you could put one outside your home and the other by the air terminal, so you don't have to lounge around inactively stumbling into your island. Expecting, regardless, you're more Bell focused, you could put a Pipe by Nook's Cranny and the other near your natural item manor or another worthwhile spot, allowing you to quickly visit the shop whenever you need.