Hey.

To become a legal advisor, you'll have to pursue a law degree from an institute recognised by the Bar council of India. As you've already done your graduation you can go for a 3 year LLb degree.

After completion of law, There are various fields that you can enter Corporate Field in Various top law firms, Multi National companies, Private companies like AZB Partners, Amarchand and Mangaldas, Trilegal, Surana and Surana, Dua and Associates, Khaitan, Luthra and Luthra and many tops Multi National companies like KPMG etc also place students as legal advisors. You should know that not all colleges offer good or any placements. Hence if your goal is to pursue any of this then make sure to go for a college with good placements like Delhi University, GLC Mumbai, ILS Pune, Symbiosis Pune, Jindal global Law School etc. There are other options like Litigation  ( practicing in courts of law), judiciary, teaching, further masters etc for which the choice of college would matter as much as it would for a career in corporate sector. Admission to various colleges is through their own entrances like DU LLB, MHCET, LSAT, SET etc.

Best of luck