Well, you have now a great concept, a great treatment, you have met a producer...
Now it's time to really convince the producer that you tv show is good enough to be produced.
For this, you need to get additional material.
When you present your show, you may be asked to provide* a demo tape, or a portfolio.
A demo tape is a tape that shows a excerpt of your tv show, it gives an idea of what it is going to look like.
A portfolio is a copybook which contains many sheets of paper to illustrate your project.
You also need to tell the producer how much money the show is going to need.
It's better if you have already a financial source. Actually, it's unlikely* that a production company pays your bill* entirely.