Starting Home-Based Business?

I'm wanting to start a home based business. I'd do personalized paper products. I could take a digital photo of anything and turn it into stationary, post cards, letterhead. I also do personalized products, greeting cards, postcards, letterhead, envelopes, business cards, etc. Anyone have any idea what I would need to do to get it started. Are there grants out there to help me fund it? What all would I need to do to make it legal? Basically start to finish building your own business. Thank you for your help!