Can someone help me how to download parograms, audio books via rapidshare.com.

You need to have the link for the file that is on rapidshare, go to link and at bottom choose Free - and then you have to wait about 30-120 sec and then a download box comes up and you download
Without buying an account from rapidshare, you are allowed to download 1 file then have to wait 45-90 min before you can download another file from rapidshare - the amount of time you have to wait depends on how big the file is that you just downloaded

RapidShare is basically a German One-click hosting site that operates from Switzerland and is financed by the subscriptions of paying users. It operates as a pay service, allowing any member to upload files of up to 100MB. The user is then supplied with a unique download URL, which locates the file and enables anyone with whom the uploader shares it to download the file. Like a MIRROR site

This site goes into more detail -- What's Rapidshare? How to Use Rapidshare?

So how much does it exactly cost? Well depending on how long of a subscription you want you can expect to pay anywhere from 10 dollars for a 1 month subscription, or around 23 dollars for a 3 month subscription. You can also get subscriptions up to 1 year.