View planned activities in a calendar

Also, is there a way to make this calendar viewable in Google Calendar for example via a URL or something?

No, you can only see invites for meetings in Google Calendar.

Than when I Save it, the Planned start date is always set as Today and not the Requested Start Date.

Because you used a planning mode "As soon as possible" and did not enter assigned work.
ProjeQtOr is work driven by default...

Also how do you modify the planned date? it is always greyed out. And I cannot seem to get activties into the calendar again... Do you have a steo by step on creating activities the proper way?

Enter some assigned work and run planning calculation.