Hey iJuan, to turn off the email reminders about what's on your calendar, sign into your Microsoft account at Hotmail.com/outlook.com and click on Calendar. In the top right hand corner it should say Options, click that and you will be taken to the options page. Untick the box that says "Get notifications (reminders, changes to calendars, and daily summaries)" and click save. Hope that helps!
Oh and for a help and tips section, have you tried the built in Help and Tips "app" in the app list on your 920? Check that out, if you haven't already, as it's got a pretty good overview of how to optimize your Windows Phone experience!