You're asking some complicated questions without elaborating much so I hope this helps put you in the right direction:
You need some kind of identifier in the data which can be used to determine if the record has changed or not (an ID, changed date, reference number etc), and use this in the where clause of your load statement. For more info see: http://community.qlik.com/docs/DOC-3891
See #1
When you have two tables with the same columns concatenate will put the second table straight below the other (i.e. double the row count). This is done instead of join which looks for similar fields to join and add columns instead of rows (simplified answer).
Not sure what you mean, but you don't specific field to join on when using concatenate, the column names must just be the same.
There are no specific limits on how many dashboards per model other than aesthetic appeal
There are no specific limits but additional hardware/RAM may be needed for bigger models
Not sure what you mean, Qlikview can read for numerous data sources and can write this data in to a proprietary format called "qvd"
No specific limit besides hardware requirements (see #6)
You don't need publisher to put qvw's on Qlikview Server, just Qlikview Server and you'd normally remote connect to the server
Easily, no problem.
On Qlikview Server you use the Management Console (http://127.0.0.1:4780/qmc/ where 127.0.0.1 is your server's IP Address) to schedule a reload. Qlikview Server must obviously be installed and setup.
Yes, same approach as above and then you need to specify an automatic loading condition such as a particular time each day or another model dependency
It's not necessary to delete in an incremental load (if I understand your question correctly), you use a condition in the where clause instead to limit it to only the newer records (see #1)
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