I'm in the process of moving from one career field to another and as part of the transition I got professional assistance from a company called "Right Management" for updating my resume and job search skills to current day standards.
The fact that you are currently working as a nurse puts you miles ahead. Focus on that experience as your main selling point. Everything else in your background, cherry pick the things that support you as a nurse: people skills, stress management, time management, computer skills, you get the drift.
One of the things that this company points out is that your resume should have an objective or "branding statement" at the top that essentially sells you to the new employer. It has to summarize you as a nurse in 2 or 3 sentences. You can follow it with 2-3 bulletized Hard skills such as proficiency on a certain piece of equipment or system and soft skills as working with seniors or kids, time management, etc. The rest of the resume can be chronological or functional or a hybrid. Should be 2 pages or less and not chock full (think white space). Bullets or entries under each job should take the format of challenge -action-result. Spell check
the crap out of it and have several friends also read it and critique it. Good luck.