Have you updated the I-9 form you need to use to ensure all employees are eligible to work in the USA? If not, the new form became effective in January: I-9 form
It is also smart to take a look at your federally required posters. While updated versions are available from several sources, you do not need to spend that money as you can just download these directly.
Not sure which posters you may need? Start with the ‘e-laws’ help section which asks about the number of employees you have and what sort of business you are in to help show the posters you may need. http://webapps.dol.gov/elaws/posters.htm
Here are the most commonly required posters for small organizations, check for others if you have more than 49 employees.
Fair Labor Standards Act
Occupational Health and Safety
Military Service Rights (USERRA)
Polygraph (yes, really even if you do not have anything to do with such tests)
You can put a copy of these posters onto a bulletin board or hang them on a clipboard. Hang them where employees can see them, use your kitchen or break room or other space open to all employees. Keep it simple.