Check out the UNL Career Services Office for your job search. You can also try the Nebraska Department of Labor's website. For general advice on your rights as an employee and in planning your career see the Youth at Work website.
Private job boards such as careerlink.com and cornhuskerhelpwanted.com can be useful, but use caution when using private sites. The best sites will not require you to enter any personal information to apply; they will simply redirect you to the employer’s website when you find a job you are interested in. Before entering any private information, including your name or email address, read the site’s privacy policy to learn how your information will be used. Also, check how easy it is to access resumes from the employers’ section of the site. If the site is free for employers to use, uploading your resume will likely only attract scams.