43 yr old filing for taxes for the first time.

I'm a 43 yr old filing for taxes in India for the first time. I've not worked in India for the past 20 yrs. And my previous job before leaving India was well below taxable limit. I moved back two yrs ago, because of parents being ill. I've now registered for a company, and will be drawing salary soon. Any thing that I need to do while filing? August will be my first pay day in India.