Newbie trying to understand indicators, scripts and experts!

 

Just started to research Metatrader. I am very new to the whole subject of Forex trading. I am looking for a script? expert? that will sound an alarm, send an email or whatever when certain conditions are met. For example when the MAV5 changes direction, or crosses the MAV21. So far I cannot even figure out how to install/run one of the many scripts (mq4) on this site.

Any help, link to help files etc. would be most appreciated.

Regards to all.

Andrew