If your grading and gutters are okay, the water is probably coming from underneath your home. In new construction, the crushed stone bed beneath the home is generally sufficient to keep the slab or floor dry. If the water table rises too high, however, any basement could get damp or wet. Sump pumps are placed in pits dug into the lowest part of the basement or crawlspace floor. As groundwater fills the pit it activates the pump, which forces the water out of the house through a drainage pipe.
Sump pumps tend to use a lot of power.
Most manufacturers recommend using a GFCI outlet and a circuit dedicated exclusively to the pump. If you're uncomfortable installing a new circuit, contact a licensed electrician. Start by removing any concrete from the area where you plan to install the pump. The pit should be about 24 inches in diameter. Dig a sump pit using a post hole digger.