Controller / model separation, templating

[eluser]ojcarga[/eluser]
Hi

1) In the controller.
2) This is up to you and the app workflow, in the case you explain above maybe would be better for you to user just one method.
3) I am not sure if I really understand this point
4) If all your app use the db, YES, if no it is not necessary.
5) I would say that if you sent back HTML you should use views to hold that HTML, this way you are going to have a cleaner and separated code.

BTW: the correct name for functions that are inside a class is method, not function