When designing methods, think of code reuse. Think in an object oriented fashion and code reuse mind set. Methods should be used for breaking up a process into smaller chunks too. If notice your code is getting messy, or your repeating lines of code, try to think of a method you can create that you can use in the future as well. For instance, a student object:
Class Student
Public firstName as string
Public lastName as string
Public Function returnFull() as String
Return lastname & " " & firstName
End Function
End Class
-- you could say "Dim fullName as string = theStudent.lastname & " " & theStudent.firstName"
Or, you can make a function such as the returnFull, and instead do this
"Dim fullName as string = theStudent.returnFull()"
Use methods to make your life easier, also you can reuse that function over and over for each new student object you make