New to Android/Galaxy S4 noob questions

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http://androidforums.com – So my new S4 GPE arrives in 48 hours and I cannot wait to start tinkering, (currently on iphone 5). I purchased a SanDisk 32GB Extreme microSDHC card as well. How can I use the SanDisk card? Can I install apps to the card? I assume/hope that I can store pictures/videos/music on the card as well? What is a launcher and why would I want one? I'd like to be able to have email, SMS, Calendar, missed call/voicemail notifications directly on my lockscreen as I do now with my iphone. Notification is displayed and I either swipe or select and then I'm taken directly to that specific appl (General)