Hi, Are you interested in industrial design, hardware, software design, 3D design, animation, packaging, retail products, user interfaces, user experience, illustration, landscaping, architecture, piping, technical layouts?

Go after something that excites you and the "how" part of it will fall into place.

Accordingly choose your specialisation. Also that you have done Btech so choose an advance level in Btech for specialization then only you shall get the right track for yourself.

Good Luck.