Summarize this article:

It should be at least twenty-four to thirty inches wide with two or more perches. The perches should to be small enough to hold the bird's feet. Prepare at least three perches of different widths. Switch the toys every three or four days (use them in a rotation).  Ladders and swings are favorites as well as bamboo rings. Always make sure that any toys you add are especially made for birds, as many things are toxic to birds. Take note that lovebirds love to chew! Clean it at least once a week. Change the water daily.

Summary:
Purchase a cage. Include plenty of toys, for enrichment. Keep the cage clean at all times.