Cloud computing refer to performing computer tasks using services delivered entirely over the Internet.
A career in cloud computing is one of the new career options in the IT sector which has bright job prospects. There is huge potential and scope of growth in the market for this upcoming technology- Cloud Computing. People with training and experience in information technology, computer science, software engineering, and related fields can find job opportunities in Cloud computing.

Eligibility:
After 12th you can go for graduation degree in engineering (B.tech)  computer science (BCA) or any related field as per your interest.
After the graduation you can go for certificate courses here are some Certificate courses:

List of cloud computing certifications:
BIG DATA FOUNDATION
CLOUD BUSINESS ASSOCIATE
CLOUD TECHNOLOGY ASSOCIATE
PROFESSIONAL CLOUD ADMINISTRATOR
PROFESSIONAL CLOUD DEVELOPER
PROFESSIONAL CLOUD SECURITY MANAGER
PROFESSIONAL CLOUD SERVICE MANAGER
PROFESSIONAL CLOUD SOLUTIONS ARCHITECT

Good Luck!