Ask HN: How to Start a Lead Generation Business for IT Case Studies?

I know what Lead Generation is, but the problem is, I have no good idea of how I can execute my plans?

Like: 1. what should be the initial size of my website (number of pages) 2. what sort of content should I add in my websites (full promotional / sales copy type content OR a professionally written website copy?) 2. how should I manage leads? (which lead is qualified and which is junk) 3. how to find buyers for my leads?