Thanks for your message and welcome to TWB!
You can find lots of useful information in the Translator’s Toolkit to help you get started 
Additionally, you can only see tasks on your homepage if there are tasks available in your language pairs! So, if you cannot see any tasks then it simply means that there are no tasks currently available.
But don’t worry because we post new tasks all the time, so keep an eye out 
As @soke35 has said, you will also receive email notifications when there is a task available in your language pair!
I hope this information is helpful, let us know if you have any other questions!