iOS to android

小弟剛剛由iPhone 4 轉到 LG pro 2
請問怎樣轉
1) iPhone contacts 去 android?
2) transfer calendar info to android
3) transfer my iphone whatsapp msg to new phone?
4) Android 有冇 app 好似 iOS "Notes" 嗰apps
Which camera app is best for android( g pro 2)

Thanks all