Hi, there!
First, did you get the free Skype download?
http://www.skype.com
Next, add your contacts. These are people you know who have Skype.
Next, do you have a mike? You need a mike to make a call. Some computers have built-in mikes. It also helps to have ear phones or the headset combo of mike and earphones.
Next, there are two types of Skype calls. Computer to computer calls are free! Your friend has to have a mike and they have to download Skype. That's all there is to it. Push the green button to speak. It's completely free!
The other kind of call is very cheap. You have to put in some money at the Skype web site (with PayPal or a credit card). Then you can call any land line or cell phone in the world. The rates are very cheap.
Does this help? Please post a reply if you need more advice!