A persuasive speech needs to have lots of selling points--reasons why the audience should agree with your premise--and lots of support for those selling points.
Develop your speech outline by deciding what reasons you need to present to convince your listeners that they should become surgical technologists. You may address considerations like job availability, average salary, length of time involved in training, types of work skills needed, types of activities usually involved in the job, and similar factors. List these reasons as the main points for your outline. Add supportive details, statistics, other information to emphasize the merit of each of those reasons.
Introduce your speech with a definition of what a "surgical technologist" is and does in brief. If you can use an anecdotal illustration of the value of the job, that would be a great way to capture your audience's attention right away. At the end of your speech, summarize the important points you have included and let your audience know how or where they can sign up for training!