Greetings!
There's a limit to how specifically I can help you if you prefer not to post your essay here, but I'll give you some general advice on intros. Remember that your introductory paragraph will contain the thesis statement of your essay, and that what the whole essay derives from. In other words, the thesis statement is, in a nutshell, what your paper is about. For example: "The field of emergency medicine requires dedication, skill, and a passion for the job, and nowhere can this be better demonstrated than in the performance of the front-line heroes known as EMTs." Now, that may not be what you want the thrust of your essay to be about; yours might focus more on the training or some other aspect, but the point is to try to sum it up in one sentence. Then, everything else in your essay relates back to that. If you are having a hard time doing that, based on what you have already written, then you might want to give your essay a critical look to make sure that it holds together, and does not wander around. If it stays on point, then focus on making that point your thesis.
I hope this helps!
Thanks,
Sarah, EssayForum.com
Sarah, EssayForum.com