Make your mind
First you should know that what you really want to do in life while choosing a career. One you enter in any specific field then it is hard to change from one job to another. For this reason, be prepared all the time and never feel reluctance to ask anyone about your career and in what field you want to go. Also read as much as you can and gain the knowledge about detective job and its related things.
Get a relevant degree
After acquiring the right knowledge about detective and its related topics, you should get an admission in the right college and university and study all possible subjects. This will enhance your theoretical knowledge about the detective business and how things go about in this unique and difficult field. Try to learn as much as possible and also read books about some of the giant detectives.
Start Applying for job
After getting your degree, start applying for the jobs which are available currently. Mostly law enforcement agencies take written and physical tests before sending you in the field or before hiring you.
Submit a strong application
Submit a strong application that will show your skills as how much capability the applicant possesses and how knowledgeable he is about the field he is going to enter. This also shows that how committed you are how you will sustain in the new environment.
Develop your reasoning skills
For a good detective, reasoning skills count a lot. You should develop good reasoning skills which will give you the required knowledge and basic steps to become a good detective.
Pay attention what is going around you and how things are unfolding. This will give you more grip on your subject and on what case you are working.
Find ways to get information
A good detective always finds ways to get information from different sources. This will also help to stay in touch with your suspects and also puts a good impression about your skills.