How to migrate the triggers and classes and components created in developer edition to the partner org so we can make it into to package. The objective is to make it into a unmanaged package..please advise.
If your end goal is to create an unmanaged package you shoud be able to do that right in the developer org. For a nice walkthrough go here, it walks you through creating a simple class and packing it up in a Developer org.
To get going, log in to your Developer Environment and then go to Setup -> Develop -> Apex Classes to create the class.
Now you're ready to create a package, so navigate to Setup -> Create -> Packages. Hit "New" to start. After providing a name for the package (SimplePackage), you'll be given the opportunity to add package components. Packages are collections of components, and these components range the gamut of the Force.com Platform. For example, you can package an Apex class, a Visualforce page, triggers, email templates, documents and workflow rules (see references at bottom for links to entire list). For this tutorial, click “Add” and select a component type of "Apex Class" and select the SimpleClass defined above. You'll end up with a package definition that looks similar to the following figure.