If you have a pro shop or a front desk, you will be more efficient operating with a desktop or a laptop computer connected to the Internet. If you don't have a pro shop or a front desk you may still need a computer at home to efficiently produce your reports but, operationally, smart phones or tablets handled by the coaches will be enough.
If you operate a pro shop, and accept credit cards you will want (not required!) a credit card reader and a barcode reader in order operate at maximum efficiency. Total expense? Well below $800 if you buy all new equipment
All you need is a reliable connection to the Internet if you have a pro shop or a front desk. If you don't have a pro shop or a front desk, good cell phone reception is a must so coaches can run the operation exclusively using smartphones or tablets.