Income tax - which form i should fill ?

When you are earning subtantially, and has the capacity to earn more, you should not bogged with such income problems and focus on profession only.  Entrust this to a sincere Chartered Accountant.  The fees you pay to him may be nominal, but in return you can retain mental peace and can concentrate on your profession.  It is always better to depend on professional advisers.  The difference between evasion and avoiding through exemptions will be known to you once you associate.  As you are capable of learning, once you attain a grip then manage your affairs independently, till then during growing stage, always take professional advises.

Dear Client,

               you should file in form S which is much simplr than the bulky form 4 ITR .

You file form 4 S which is much simpler than form 4 which  is  a lengthy and vbulky 20 page document.Since your professional income is less than Rs.50 Lakhs  you can file ITR Form 4S. There is no needfor maintaining books , Profit and loas acount statemens and audits. since  you are  afreelancer apart from salaried employee.