Remember that, while you are taking a risk by signing up people who you don't know, they too are taking a risk with you and your new product and company. They need to believe in your product and your ability to deliver. Before you select the group or groups, you will need a rep agreement to be signed by you and the rep group. This agreement spells out what territory the group is responsible for, what the commission rate is, and when it gets paid. We specified in our agreement that the commission isn't due until the order is paid for.
Some reps expect payment of commission after shipment.
This puts the entire risk of collection on you. If you specify that the rep doesn't get paid until the order is paid for, it gives them incentive to help collect late invoices, write more COD orders, and it helps your cash flow. In addition to paying a commission, you will need to provide your sales representatives with samples and catalog sheets. This can get expensive. Don't be shy about charging for samples if you need to.