Welcome to SoM! :)
There are some places you could start around the site to get you going. Scroll down to the bottom lefthand corner and look under the "Help" section. There you will find Newbie Central, Tips (on spell casting) and FAQs. I suggest you read through those.Scroll to the tabs at the top and there is the "articles" tab. Clicking this will take you to the featured articles, which I suggest you read. They have good solid information.
Many people also suggest you learn "the basics". If you type this into the search bar, several relevant articles and forum threads will pop up. Here's a link to help you out: