I want to find resources/support for starting or growing my small business in Portland

For help with developing your business plan or general small business guidance, check out the Portland Small Business Development Center. They have free classes, counseling and mentoring.
SCORE is an organization of working and retired business executives who volunteer their time to assist people in starting up new businesses or growing their existing small business.
Mercy Corps Northwest offers a variety of services to individuals in all stages of Business Development and is one of the few potential sources of financing to entrepreneurs who are not "bankable" but nevertheless have viable business ideas.
Prosper Portland (formerly the Portland Development Commission) has several business finance programs to assist businesses.

The City of Portland, Oregon