What is the 1st step to get a good Job in Autocad Architecture/Interior Design/Construction Industry after the Course & Training from Institution..?

Try continuously to get in right organization. Always Brush up skills. 

In first organization / first year (minimum) focus must be on learning and growing. Dont prioritize finance. Once you are skilled ask for increment or move to an Organization who shall pay you better.

Keep passion in your work. Always be open to new thinks, commands, softwares etc.

Field knowledge and practically experience , Auto CAD based on the experience just experience.