With the questions you are asking, you really really really need to get with an experienced modeler to advise you as you work on this plane. I'm going to give you the next in many tips you'll need on your way to flying RC - if you don't know how old that battery is, throw it away. Throw the switch away too. If the plane has been in storage a long time, all of the radio gear may be unreliable now too.

Moving on from the plane, I need to ask a question. Do you actually want to get started in RC modeling and flying? It's a great hobby, but it's not just a matter of getting a plane in the air. There is a significant learning curve to RC flying that will take some time to get through. And yes, a basic budget is required. If the only point of all this is to see the plane fly one time just because you have it, give it to an experienced RC pilot on the condition that he take you out for a buddy box flight or two once it's refurbished. But if you want to be an RC pilot, we can definitely help you get there.