During course of your employment as govt servant you cannot carry on any trade or business
2)n rule 12 of the Central Civil Services (Conduct) Rules, 1955 (now Rule 15), prohibitis engagement in any trade or undertaking of any employment by a Government servant other than his public duties. It may result in some deterioration in his efficiency because if he does part-time work in addition to his full working hours in his office, he may not get sufficient time for rest and recreation and will, therefore, be unable to give undivided attention to his work
3) for carrying freelance work it is better you obtain prior sanction of competent authority