Hello.
We can't tell you how to build an iptv server as that would be illegal.
You need a software panel and lines to iptv providers. Those are not cheap, neither are decent servers which can keep up with the load you will be getting.
You might better consider a reseller account like Nummer10 said, with an already existing iptv seller, which will cost you lots less.
And now, we can't and won't point to iptv resellers...