RNS 510 +bluetooth module install to B7 Estate

[Sarunce]

Hello

Im new here but maybe some one will be able to help me with this.
I had the RNS 315 in my Passat that i want to upgrade to RNS 510 i got that put it in all good( wrong ) no bluetooth.
Find out on some forums that i need the bluetooth module to be installed along side the rns510 as rns315 has build in unit.

So my question sin now what model of the bluetooth to get as i can see a lot of them online.
And maybe some one can give me some guidance how to get it to work.

what i have now with the RNS510 installed in my car that works as it should do:
MDI in the glocve box works fine
AC controls + parking sensors are displayed on the RNS 510
Sat nav works OK
steering wheel controls work fine

DONT WORK:
Have no display in my MFD for what song im listening to, navigation not being displayed and no phone.

Can some one help me with these issues?