Try reading lots of job advertisements and position descriptions from a range of companies. Talk to others already working in your target field and then come back to yourself and evaluate your existing knowledge, skills and experience.
So how do you go about it? Search for, and read a variety of job advertisements from across the country for the job you want. Don’t just read local advertisements, as they will only give you a limited view, and you need to know standard requirements for the industry. Compare position descriptions, how do they differ, how are they the same, what are the common threads across each document? Talk to people working in the industry, how does their knowledge and experience fit with your research, how did they go about getting their job? Lastly, explore your own history. What have you done? What skills and experience have you gained? What challenges have you encountered and what are your achievements? What do you have to offer that the industry wants?
When you have done all those things, ask yourself how you measure up, what you need to do to enhance your chance of success in applying for jobs in your target field.