Firewall Groups - Pointers to good documentation or proceedures

Does this help:  Sophos Central Firewall-Group: Clarification needed, how do these Policys get applied  

I did see that, but it wasn't clear to me.

1 - what's a namen ?  Is that a typo for name?
2 - what does 'push' mean - Is there a separate step to apply the policy to the firewall AFTER it's put in the group?
3 - Maybe I'm thinking about this wrong - if I start with a blank policy for the firewall group, and import a firewall, what happens?  Does it remove things from the firewall we've imported?     Or does it only overwrite what's on the firewall when they both have the same name?  But it adds missing things?

Yes sorry- Name means Object Name. 

Everytime you touch the object in Central (edit, create, delete) it creates a job to push. 
If you add a firewall to a group, it will push the entire group to the firewall (you can skip this, if you want). 

If you create a new group, it will import the objects from the firewall to central (basically create a copy of the firewall in central). If you add the same firewall to the group, basically nothing will happen, as all objects are already on the firewall. 

OK.  Thanks, that's a little clearer.

One more question.  If I have a completely blank group, and I add a firewall to that group, it will not change anything, right?

It doesn't delete existing local settings?

Then after that, if I add a thing to the group settings, it will add that to the firewall?   

OK.  Thanks, that's a little clearer.

One more question.  If I have a completely blank group, and I add a firewall to that group, it will not change anything, right?

It doesn't delete existing local settings?

Then after that, if I add a thing to the group settings, it will add that to the firewall?