Make sure cords do not create trip hazards. Securely mount the tree in a stand with a water-type reservoir. Add fresh water daily. One freshness test is to lift the cut tree a couple of inches off the ground and bring it down abruptly on the stump end. The outer needles should not fall off in substantial numbers.
Inner needles do turn brown and shed naturally each year.
Trees should be sawed off at an angle at least one inch above he original cut and kept in a pail, tub, or other water container. Maintain the water level above the cut as long as the tree is indoors. Natural trees may be decorated with electrical lights. Use only UL-listed miniature lights in perfect condition. The extension cord wire should be equal to or larger than the wire you plug into it.