There are several factors that define what kind of pumping system you need to get water into your home. Well type, well depth, static water level, distance of home from well and highest point of water usage just to name a few.

Residential use:
Standard system
Constant Pressure system

Adding an irrigation system: 
How much water does my well give me?
How big is my pump?
Do I need water in my house during sprinkling times?

The biggest question is the first on the list. Not every well gives the same amount of water. A bigger pump installed without checking the first question out will end in a large amount of wasted time and money not to mention frustration.