Government grants don't exist that I know of, but loan programs are. But, seriously think about things before you take on a loan. Have a solid plan for paying it back, and make sure that you have assets to begin with before taking one on.
Like student loans, the funds come from private institutions, not the government. Those lenders are called 7a lenders, and you will have to qualify for their loan and pay interest like any other business. A personal loan and a business loan have different requirements for qualification, so you'll have to look into the options if you're going to go this way.
The other thing is venture capital, but many times it will cost you equity in your business, as well as control. There's no free money for this kind of thing.
Go to
www.sba.gov if you are serious about this. There are resources that are very helpful for this type of thing. They also have a program called SCORE. It consists of retired execs who volunteer their time to help people begin small businesses. You're paying taxes for all this, so use it.
This type of business is not a great business for starting on a shoestring. The overhead, inventory, and other expenses can be pretty staggering for a niche market.