Creating an Account is a simple three step process.
Click Create an Account;
choose a User Name;
and choose a Password.
Once an account has been created, log in and the above page will come up, with your User Name | My Talk | My Sandbox | My Preferences | My Watchlist | My Contributions | Log out appearing in the top right of the page.
Click on any of these to proceed further.

 

This is a copy of my first My Talk page.

 

This is a copy of my first My Sandbox page.

The three basic guidelines for writing a good article include:-
1. Summary of the topic
2. Reason why the topic is notable, and
3. The article text with reference to credible source(s) about the article.

Above is the basic guide to the syntax to be used to make the article look correct.
By referring to already written articles, and a little practice, your first entry can soon be up and live!