First of all, it's important that your profile represents you and your music. After all, this is the first impression you make on potential bookers. A complete profile has a clear profile picture, a short description about you as the artist, a YouTube video of a live performance and 3 audio files (DJ's need to upload at least 2 audio files/sets).
If you have your own website, we advise you to put the Gigstarter widget on it. This is a book-me button that links your website to your Gigstarter profile. This increases the chance of getting bookings and it makes you easier to find online. Find more information about placing a widget here.
The Call to Action button on Facebook is a handy tool to attain more bookings. It's only possible to add this button on a Facebook page, and not to a personal Facebook profile.
The Call to Action button will refer interested bookers to your profile on Gigstarter. You can find out how to add this button here.