Determining that the things of this age are more significant than the kingdom of God. Desiring that which is not needful to you. In a practical sense, materialism is placing your highest priority on accumulating, protecting and valuing what is tangible and physical. It makes me think of using stuff for security, for image, for acceptance and status, for power, for escape, for pleasure and for hope. It means looking for satisfaction in a place other than God.
Materialism is an overemphasis on material things versus spiritual things.
We give of our money, time, energy and of all we have received, like our education. My primary responsibility is to support my family before others. Scripture is clear on that. Most of us can do this and still help the poor. First you give to God your tithes and offerings.