informal recruitment

I have been looking for additional information on the process and how to make sure the houses I am interested in, know that I am interested, other than, 'fill out the form and wait' - it seems there are several different views on how to get your name out there and I am curious what is really recommended.

I guess, I conflicted because the approaches can potentially backfire, I don't want to be seen as annoyingly persistent or not aggressive enough, too excited vs fake