If you do not attend SJSU in your first term of admission, your status will be cancelled. You will need to re-apply through the California State University website to attend SJSU at a future time. (Please refer to http://www.sjsu.edu/registrar/faqs/Attendance_and_Policy_FAQs/index.html#q4)
To apply to change your current Major to MSDA send an email to firstname.lastname@example.org and submit your request to transfer your application documents. Note that you can only apply to change your major in your 2nd semester. Download a Change of Major form. from GAPE.
Recommendation letters will not be considered in the admission decision.
No, the MSDA will not admit students in Spring 2019. The next admission cycle will be for Fall 2019 enrollment.
It is not necessary for you to take TOEFL again. Your SJSU degree is sufficient to satisfy the English requirements.
Current graduate students at SJSU will not be able to transfer to this program. Instead, you will have to re-apply through Cal State Apply.