The following is a quote I came across in my reading.
If the Lord has called you into full-time Christian ministry, it is His plan that you be supported by other Christians except in unusual cases. It is His plan, not just your or the missions.
Support raising is a ministry. It is not begging people for money. Rather it is an opportunity for you to share your vision. People must be challenged to have a part in the Great Commission through you.
Support raising provide opportunity for blessing to those who give to you. And God gives them credit for your fruit. (Phil 4:17-19)
Partnering in your ministry is so much more than money. It is spiritual fruit to their account. Be sure that you are a worthy investment.