Measure your lawn to determine the size you will need your large sprinkler design to cover.
Locate your nearest water source in your yard. Identify the water pressure and contact your local water supplier to ask whether you will need a permit for your large sprinkler system.
Research the different types of sprinkler heads. Rotor heads turn and spray water in different direction whereas fan head are set and spray water statically. Decide which design your prefer and will suit your design.
Investigate the sprinkler heads with the size of your lawn. Analyze whether the heads will offer your the range you need. Check sources online for a variety of head sizes.
Sketch the size of your lawn on graph paper. Draw a circle in the middle to show your sprinkler head and a circumference of the distance as to which your sprinkler head will reach.