custom greeting card webapp w/mobile app

I would love to build a webapp that members could customize a greeting card template however they would like, their own text, upload images, etc. Would probably start out as an ecard webapp with share to social media, email, and maybe even text messaging feature. Then add a mobile app as we start rolling the members in. Then after decent exposure we could offer done-for-you print and mail service. Then my dream is to open gift shop with kiosks where customer customize greeting card in store to print and mail themselves or we mail for them. But right now would like to just start out with a webapp that members could customize a greeting card template however they would like, their own text, upload images, etc. With the option to share to social media, email, and maybe even text messaging feature. I could help with the design of what the webapp will look like..