The first thing you have to figure out is whether you're a big or small employer because the rules are different. Generally, if you have fewer than 50 employees, you're a small employer; 50 or more makes you a large employer.
The federal minimum wage is currently at $7.25 per hour, as established by the Fair Labor Standards Act. This rate has not been raised since 2009. Employers in every state are required to pay all employees this minimum rate.