I adverted it before 100% finished (still need to add gutters and do landscaping) and it worked out for me.

I took out copious amounts of expensive adverts on Trulia and Zillow about mid year, but looking back on my transactions to date, Bigger Pockets is by far the winner on quality leads!

I have seen Craigslist listings adverting these options in my area.http://www.lonestarlandlaw.com/Lease-Options.html

ONe thing though that I see were folks just do not give enough information on their adverts  so they really don't know how to write an advert those folks are wasting their money and time...

I am looking to advertize/ market for investors in my area in local newspapers and websites.

I currently manage the marketing efforts of over 1,500 single-family properties and despite our digital adverting and online efforts - our FOR RENT signs generate a large portion of our traffic.

As for advertizing, it varies by city. 

I already use apartments.com for my auto payments, zillow for my advert. 

She should let them know the rental requirements before showing to avoid tire kickers wasting her time, but completing a full application will deter quite a few people (because people don't want to do anything extra).For advertizing, find out what is the best couple of rental platforms to use for your area (because they do differ by city) and make sure she posts the ads there. 

I think a cheaper and psychologically more effective advert is 5% off your monthly rent if apply by "this date".