Here are some tips to help keep you from running yourself out. Sitting at the computer in front of the cam for hours at a time can do a number on your body if your not taking time to take care of it. Keep your body in tip top shape and keep the customers happy.
Use Audio Instead of typing all the time you can give your hands a rest for abit.
Use a Bed or Comfy Chair I've heard of girls using the hard floor to cam from. When your working for hours at a time that can get very uncomfortable on the body.
With so many web cam sites out there it is wise to check some out and see how the traffic is, What they offer, Payments, Etc...Once you have it narrowed down it's time to fill out the "Model" form. Many sites offer sign up for "Solo" cam models and "Studios", "Multiply" Accounts. You will be selecting "Solo" and it's a quick and easy process. Often you can be online the same day and making money. Many sites give you a few days, weeks as "new cam girl" status, so make the most of it and work your room to get return visitors.