What is a funding opportunity number and how do you get one?
A funding opportunity announcement (FOA) is a notice in Grants.gov of a federal grant funding opportunity.
You are not going to find the grants you are looking for on grants.gov. Those grants are almost entirely for nonprofits, educational institutions or state and local governments. There are grants on there for individuals, but generally for science related purposes.
You can find resources at your local Economic Development Center, Small Business Administration office, and SCORE counselors.
You can also try entering your business idea at ideablob.com. They have an ongoing competition for funding.