New car issues

[audia4cardad]

I bought a 2015 audi a4 estate car 2.0 diesle from car store chesterfield yesterday.

First of all I cant find anything on youtube about how I connect my phone to play songs via bluetooth does any one know?

My model has a micro card memory card option too does anyone know the biggest memory card itll play music off?

Also I noticed the air conditioning unit only blows air out of the left and right vents not middle vent- shouldn't it blow stuff out of them all?

Finally it said my model has cruise control does anyone know what you press to activate it?