Can you confirm it's single vCenter setup and NSX manager is registered with it?
Hi, have you configured VXLAN and the Segment ID Pool?
Could you share the screenshot of the Logical Network Preparation tab and its sub tabs?
Also the vCenter user role on Nsx may prevent creating network services like Security Adninistrator role. What is the role of Vcenter Web client user? This could be seen on NSX Manager >Manage>Users tab
I can see from your screenshots that you have deployed a controller and performed host prep (where NSX VIBS are installed on host) . However, your last screenshot shows the VXLAN stack is not configured). This is a prerequisite to configuring a Transport Zone. As an earlier poster mentioned you'll also need to add a segment ID pool.