How to include a external class file for creating a new obje

hello all

Im new to ruby and im just trying to see how i can instanciate an
object that is defined in a class file like myclass.rb then in another
class file like start.rb i just call it like so, newObj = myclass.new do
i need
the include statement at the top? like include myclass.rb or mayby the
require statement? Thanks