Affiliate Marketing Secrets

I have an idea for a women’s bra line and I’d like to start delving into making this a reality instead of just a general notion. I know the niche I’d like to fill, and I would like to just do this as a small business from home, selling the pieces via the internet. The thing is, I’m only 19 and have no background in design or any idea where to start in producing quality bras, nor which manufacturing companies to look into. I’d like to find a way to manufacture a few designs inexpensively, rather than hand-sewing or anything like that.
Basically, does anyone know of any sites that might be helpful research areas for my business idea? I’m doing research on my own, but it’s always good to check with others who might know better where I should be looking. Thanks!