You have started with the aim to get Aadhaar Number Card, naturally the first and foremost thing required is Aadhaar Application Form. Next come availability, then form filling, required attachments and lastly submission point.
Cost - Free, Aadhaar Application Form is totally free, there are rumors and complaint about fee charged, some people asking money in lieu of the form but from government and authority side applying and getting process is cost-less, free and really need no money.
Availability - Both options are open, you can get Aadhaar Application Form online and offline in printed format. The online form is available in pdf format need Adobe Reader to view which also is a free application software. Here it self you get link and full content, even alternate form download also provided.
Language of Prescribed Form - English, Hindi, Telugu, Tamil, Malayalam, Gujarati and many languages Aadhaar Application Form are available to suite your need.
Precaution - To be on safe side at least one additional copy of Aadhaar Application Form to be taken or copied from original. Use it as your own office copy. Carefully read the form content to your satisfaction and understanding, then first fill the additional copy which will serve later as record available with you. Then with full confidence fill the final form for submission.
Many people may find it difficult to fill the details on their own, in that case take help of some family, friend but must be reliable. Before putting your signature, you yourself read carefully the entered details in the Aadhaar Application Form for accuracy of data.
Submission - Find nearest active enrolment camp or office to process Aadhaar Number Card issue and submit the duly filled Aadhaar Application Form to appropriate person and do not forget to take the receipt.
Online Aadhaar Application Form Download - Here is the full link to pdf format http://uidai.gov.in/images/FrontPageUpdates/uid_download/enrolmentform.pdf - Save in your computer or take print out as per your requirements. This is official form from UIDAI website which is Hindi and English language content side side.