Advice for a noob:
2. Search is your friend.
The E70 has been around so long that there is a HUGE amount of valuable information here on the 'Fest. A couple hours spent reading threads will pay huge dividends.
A couple features you will want to discover, that a lot of owners miss:
Residual heat: you likely had this on your 550, but it is activated differently on the X5
Hill Descent Control
Turning off DSC - when you want to do it, and how to do it.
Why you will occasionally see just one fog light illuminated, and why that shouldn't send you into a tizzy.
Good luck with your new ride.
2014 535i MSport Space / Black, ZCW, ZDA, ZLP, ZLS, ZPP, H-K and 704
2015 X1 28i xDrive Alpine / Black, xLine, ZCW and Ultimate
2015 X1 35i xDrive Black / Black, ZCW, Ultimate and Xenons
2014 328i SportWagon
2011 535ix MSport
2011 X5 35D
2008 ///M3 Vert
2008 X5 3.0
2007 X5 3.0
2006 X5 3.0
2006 550iA SP
2003 540iA M-Technic