AWR

From the main SGL page: http://stargazerslounge.com/, click on one of the forums, Welcome or Beginners Help and Advice, for example. Near the top, there is a box: Post new thread. Click it and you are away!

Andrew

You'll get more replies of you post in the Forums than in a blog.

You could have a look at doing an Open University course in astronomy. If you're committed, you'll havre no problems alongside your A levels

Just click on the appropriate forum, eg. Beginners Help and Advice. To start a new thread (ask a new question) there is a button New Thread above the list of threads.

HTH

Andrew