That is not a label that is a text field. Drag a label across from the object library, it will have type of UILabel. If you are using the latest version of xcode you should be putting an underscore on the front when referrring to them locally,
[_label setText=@"Hello World"];
self.label.text = @"Hello World";
Yes, you do not need to synthesise them if the setters and getters are as simple as above. In recent versions the "_" on the front is for the internal representation of the property. You also do not need the statements on lines 3 & 4.
Properties are the external attributes of you class coffeeShop. When you create an instance of this class you can then set these properties.
I am not sure why you have declared input and i as arrays, this seems wrong. and the * before i in two spots on line 11 should not be there. an int is a primitive of the language and not referenced with a pointer.
you could perhaps add another column called "selected" to your employee table which is a Yes/No value that users can check. Then have a piece of SQL to insert the employee ids of the selected values into the other table, somethings like
INSERT INTO newTable (EmployeeId) SELECT EmployeeId FROM Employee WHERE Selected=True
This is not normalised properly, Time, Date and Day should all be housed in the one field using a type of Date/Time. When you display them you can choose to display the one field three times for each of the values.
I think you are jumping the gun here, for example the decision to save your records is a decision for the technical design. At this stage you don't really even have functional requirements tied down, let alone a functional design. Start with a needs analysis, ie a detailed understanding of the need you are trying to address and from that derrive the functions that the software must perform. You can then start looking at how you are going to implement those functions technically and I am thinking it is probably not going to be a text file. Unless, of course, this is a student assignment in which case you should be writing it yourself.