First, I hope you have a formal business plan on paper.
You can go to the SBA about a loan at https://www.sba.gov/, or if you live in a fiar sized city, there may be a local sba. Traditional banks will consider loaning too, but they will expect you to pony up or raise a lot of the cash on your own.
As far as other to invest in your business, I think you may be looking for a venture capitalist or "angel." A venture capital firm or angel investor can provide you with startup monies, but it is usually an investment, not a loan, which means they would own a portion of your business, be able to sell their part, and have their say in how you run it.
A third option would be a grant....if you are a woman or minority, these are fairly common....just search on Yahoo here for small business grant woman or small business grant
Best of luck! My wife and I went through this a few years back, and it can be a real hassle, but work and persistence in searching for start up $$$ can create great results!