The "First Posts" queue is all about helping a new user see how things work here. As such there are only really 3 options for outcomes:

 1. The answer is great and has no issues at all: 
  - Looks OK
 2. There are some content or formatting issues: 
  - edit it
 3. There are major issues with the answer or the user is doing something wrong:
  - leave a comment telling the user what is wrong

A higher rep user may also be able to vote to delete the post, but the result is the same.

Each review queue has a philosophy, which can be gleaned by looking at what powers you have available in each queue.