Welcome aboad L21.
You have found the premier Handi site in the
world. Scratch that, the universe.
Like has already been said check the FAQ's and Handi 101 threads at the top of the H&R / NEF forum.
My advice is give it a good cleaning and take it out and shoot it.
Any problems come back hear and discuss it with the true experts we have here.
I wasn't a much more than of the thought Handi's were just good truck guns before finding this site.
I am now like many others here, addicted to them.

They are great guns that lend themselves to many different applications.