Use post as template for page

Hi there,

I am having a little trouble with an internet shop provider. Their service is really great, but they require me to have a “published website” with the released product.
That’s a tad unfortunate, because I already run a website. So if I would publish, even a password protected, blog entry it would get published to all news feeds and it would confuse and annoy everyone. Plus it would reveal what I’ve been working on. Unfortunately all these problems are meaningless to them.

So, as far as I can tell, my only option would be to publish a password protected page that looks like a post (I make video tutorials and the post/page includes a teaser video).
I was told this is possible with WordPress, but I haven’t found any resources on the web. Can anyone point me in the right direction please?

Thanks,
Zettt