Income tax retrun calculation for salary + adv.proff. fee

Hi,  need an tax advice for individual . 

How to calculate Income tax return  for Govt. employee turned lawyer- having income from Salary (govt.) for few months  and rest of the income through  professional fee (Lawyer fee) wherein TDS already deducted from both sources. 

1. Whether both incomes needed to be clubbed together for income tax purpose ?

and

2. whether taxation slabs /rate of tax is different for Professional fee and salary ?

 Thanx in advance for reply