I spoke with a client via chat, he sent me the project details and what he's looking for. Then I built my proposal, detailing every task and step of what I'll do, delivery time and budget needed, then sent it.

I've gotten only silence as an answer.

I didn't charge for any of that...

So, do you send your "project plan" (I don't know the word for it in this context) to your client? How do you get them to pay you to do this kind of things before even starting the project?