As a Virtual Assistant, I have a few avenues where I advertise my services and also can bid on new work. Some I have had better luck with than others.
One service that I have had the best luck generating leads AND gaining clients is Thumbtack. Thumbtack advertises for many different service areas, not just administrative services.
I receive emails when clients post an ad for a service they need performed. I then have the opportunity to submit a quote. If the client is interested, they have my contact information and can call me directly.
I can take steps to improve my profile such as upload pictures and answer questions about my services.
Check out my profile: Virtual Assistant Services
It is free to set up your profile. It does cost a few dollars to submit a quote and bid on jobs. The most I have ever had to pay is $4. To me, that is a small price to pay for a strong lead on a new client!