Finding new renters : how do you do it?

[Sam P.]

I bought my first investment property late last year and now one of the renters is moving out. Looking for advice on how all of you experts go about finding new tenants.

1.Do you use a real estate agent or do it yourself?

2.If you do it yourself, where all do you post? Craig's List? 

3.Do you use Zillow?

4.Do you use apartments.com? Basic listing or premium listing

5.Do you put a "For Rent" up front of your place?

6.Do you use rentals.com or any other website?