Welcome. First, no need to generate multiple threads/posts asking the same stuff. I'll answer here because I like numbered lists.
1. Ask script sellers for sites that are using their software. If they don't have any real working examples, then I wouldn't advise being the first.
2. Cool.
3. Two common methods are advertising and running an affiliate program.
4. No, all cam sites always lose money.
As you can see from the other thread, the general advice was try a white label first.
In that vein you could:
1. Add your models to Streamate.
2. Create a white label at cambuilder.com (Streamate).
3. Restrict the models on your white label to just yours.
Your models would then have immediate access to the existing members on Streamate (and could/should be working on other sites too) and new members you generate on your white label, which you would also receive white label affiliate payments on.