Hi rani,
You can file return as providing professional service under section 44ada (under presumptive taxation) where you are not required to maintain books of account (income and expense details).
what ever is your earning based on your bank account will be considered your gross income and 50% of gross income will be taxable income based on your tax slab.
you can claim deduction under 80C.
and as far as professional tax concerned technical consultants, engineers, are exempted from payment of profession tax for the first 2 years of their practice. (Subsequently the tax ranges from Rs.1000 to Rs.2500 depending upon the number of years of service)
There are certain conditions to be fulfilled and applied to claim presumptive tax. kindly refer the link below.
http://www.charteredclub.com/section-44ad/
I assume as you are going to provide services to overseas from remote base , your expense will be less. so it will be beneficial to opt the above option.