These are very straightforward evidence questions, 99% you will be approved if questions are answered properly as numbered by you above
Needs your hire or appointment letter copy
Prove what the company does is related to what your expertise is, a 2 page letter would be great with question copied / pasted on top
Employer CPA will provide you this data if you explain what it is for
Sandeep Shankar, Ph.D.
Academic Advisor (India) to The Executive Director
Colorado Heights University, Denver, CO 80223