Build me an app

We are a media company publishing three monthly magazines in English language and an annual directory. Have head office in New Delhi and regional offices in Mumbai and Bengaluru. Our division in Gurgaon organises own annual events and helps clients organise their events anywhere within India. We need an app to enroll subscribers, sell content (print and online), sell training kits, book ads for our publications and offer mailing services to our databases. Perhaps more features can be suggested by someone who may have done similar work. You can look up our activities on [login to view URL] My name is Romy Chopra. I am a director in this company.