You say it's a 1955?. There were two series of '55s. One was 6V (first series) and the other 12V. You need to determine what you have before you stick a battery in it. Go to the "Gallery" and compare it to the pictures there and let us know what you have.
Better yet, you say you are computer savvy, post a picture.
Lots of good info here and some of it seems to condradict other. Let me add a few things.
Hot wiring won't hurt a thing. Just be sure you use a 6V battery if it's a 6V system or you risk frying your guages. And if it has a stock starter you won't be jumping the solenoid. There is a big button on the floor near the accellerater to push with your foot.
One other thing no one else mentioned. Old trucks are addictive. One puff and you're hooked. You've been warned.
And most important- have fun.