Seeking workflow advice re format settings

Hi there I am just about to pick up my brand new Sony PXW-Z190 4K 3-CMOS 1/3" Sensor XDCAM Camcorder. So I am upgrading from my beloved Sony Z5P which is of course a tape based camera. So I am wondering what is the best format to shoot on with my new camera and best format to edit on? Is there any advantage in shooting in 4K? I do simple doco-style productions for organisations that require digital video clips to promote their programs and services and they are uploaded to social media platforms and websites. Have always got good results shooting and editing in HD. The advantage of the new camera is of course that I no longer have to rely on tapes. Any advice to help me with this transition gratefully received. 🙂