It's very rare to find a manager with leadership skills that will guide your crew and turn a good profit. When you do find someone good, make sure to base their pay by company earnings and a decent salary.
Example: Lets say a good manager makes around 1,200 weekly. Try to have his salary pay $700 and say 2.5% of total gross sales per week. Lets say if you did 15k of business, you times that by 2.5% and that will be the remaining incentive/bonus. It keeps your manager always trying to produce more income for you and more $ for him.
You have to figure out your business and what works to keep your employees motivated and happy.