I always try to write 3-5 posts without outgoing links on every domain in a pbn. Then if i do a pbn post, i link to my moneysite and i also link to a different site (the content of this site should be relevant to my moneysite). I also add pages like privacy policy, about me page, fb fanpages, newsletter plugins to the pbn domains. To get no footprints i also install different plugins if i use the same cms. Normally i do not use videos, images alone are fine for me.
Like others mentioned before me, build your pbn domain like a real homepage.
Have fun with your pbn!