Your first question is your FAR (first assignment review). The system is set up so you won't be able to check out more work until your FAR is reviewed and complete. The purpose of the FAR process is to assure you are aligned with project requirements, so this critical step must be completed before moving on.
The FAR process is over when you’ve received feedback, made any necessary changes, and clicked I’m Done. Right now, your answer is in the reviewer queue, and will be prioritized so that you can write more answers soon. Once your FAR is complete, you will not have to wait for each asset to be reviewed before checking out more work. You will be able to check out another assignment as soon as you submit one.