If you’re looking for rental leads than you should set yourself up on Nakedapartments and Zumper. Craigslist is dead and getting leads from there is incredibly difficult. The great thing about nakedapartments is you get leads that have contact information and a profile to tell you what they’re looking for.
For sales leads, you can try running ads on Zillow if you have a good profile, or work on setting up a drip campaign to convert renters to buyers.
best of luck!