Should I need to enroll in MS Computer Sciences to boost my career as a marketer + web developer (I already done MBA).

I want to excel my career in web development and networking. As a business graduate (MBA), currently I am working as a online marketer; SEO, SEM, SMM, Analytics, Business and Competitor research and strategy formulation. But you know that in e-businesses, a person should know the basic of HTML, PHP, JAVA and .net plus adobe family for designing tasks. I want to learn computer sciences too.

Tell me how long it takes to complete the computer sciences degree after MBA or any good source online for study.
OR if short courses in web development and coding help enough.

Thank you