...
Start using QLess by entering your customers via CEC or Queue Manager. Only enter their name with no phone number so that they will not receive the text messages. This will allow you to practice your internal workflow without the customer interaction piece.
...
Allow customers to join remotely.
Don't forget to market QLess and the ability for your customers to join from anywhere! Creating flyers or other materials to promote the ways you allow your customers to join the line will help your customers utilize what the system has to offer!