To start an IPTV Business you will require the following things:

IPTV Panel / Middleware - Like Xtream UI and ZapX
Dedicated Server(s)
Streams / Source / VOD ( Content )
Website For your Services
Billing System for Xtream Codes Panel
Android App for your end-users
Web TV Player
iOS App for your customers
Smarters Solutions provides you the complete billing Solution and Apps for Xtream UI and ZapX etc but you must need to buy the first three things on your own. They provide you the white Label IPTV Software Solution.