You can use this tutorial PDF files which has commands that can be used on MHF. It was created by MathMan.

http://www.mathhelpforum.com/math-he...rial-latex.pdf

Also, this forum has a latex mini-forum where users can test latex. It has many tested latex by users which can be useful and has some useful external links too.

http://www.mathhelpforum.com/math-help/latex-help/

Another point, google is your friend, so a search on google will bring many Latex help. Within a few days/weeks, you too will be a latex expert.