You can make your WordPress website unavailable to visitors until selected date. To enable this option login to Administrator back-end.
1. Click the Appearance→ Theme Options → Basic Settings
2. Find field Coming Soon and click ON button.
3. Next set date in filed Coming Soon Date.
Click the Save Changes button to implement the new settings.
Title and description you can change in Appearance→ Widgets. Find widget Our site is coming soon on sidebar Coming Soon. You can also publish different type of widget if you like.