Tourist visa for package tour booked for 3 nights 4 days

Hi
I and my wife have booked a 3 nights 4 day package tour in Beijing. We will land on the 25th of Feb by Air china flight and spend 3 nights and 4 days in Beijing doing this package tour. We will be flying out of Beijing on 28th of Feb 2019 by the evening flight.

Please advise whether we can get voa at Beijing or whether we should be applying for a visa in advance. What is the procedure and cost for this short stay in Beijing China.

Please advise
Kind regards
Kelly Soorty