Service tax on professional incom from india & abroad client

Hello,

Thanks in Advance for your Reply. I have few scenario

Q1) Gross income from Technaical consultancy is Rs 9,60,000 Per year From India company. Do I need to pay Service tax or need to register with it. Also Can I use section 44ADA to claim 50% of expense ???

Q2)  Gross income from Technaical consultancy is Rs 8,00,000 Per year From India company & 1,60,000 From USA based company paid in USD via Paypal. Do I need to pay Service tax or need to register with it. Also Can I use section 44ADA to claim 50% of expense ???

Q3) Gross income from Technaical consultancy is Rs 8,00,000 Per year From India company & 4,60,000 From USA based company paid via Paypal. Do I need to pay Service tax or need to register with it. Also Can I use section 44ADA to claim 50% of expense ???

 Please answer all the three query seprately.