I understand that you are setting up the Slingbox PRO for the first time, however it shows the power on and network light only.
If the Slingbox shows solid lights, you will be able to set it up for Internet Viewing. However, you did not mention anything about the Slingbox logo light. In all case, the following link will provide you with the information about the Slingbox lights.
If you need assistance or instructions about how to set up your Slingbox, make sure to check this link and follow the indications.