Monitor + DVD + DVB-T install

[antc101]

Hi everyone.

Just got myself a 7 inch monitor + DVD/CD player + DVB-T reciever (freeview) units.
All of the above are separate units, and not one big combo.

My main concern is when the DVD player is connected (it connects via standard ISO DIN - forgive me if the lingo is wrong), will audio for any DVD I play come out of the car speakers? Or is there another cable that will handle this?
I ask this because it has RCA audio cables for connecting to a monitor, which I obviously don't want to use.

Also what I'm worried about, seeing as the only Composite video input on the monitor will be in use by the DVD player, how would I connect the DVB-T unit to the monitor?

Here's a picture of the DVB-T unit...

http://www.atomicaudio.net/ProductDetail.cfm?ItemID=3332&ShowExtra=4
That is the URL for the monitor...

http://cgi.ebay.co.uk/LATEST-in-car-DVD-VCD-CD-MP3-MP4-SD-USB-AM-FM-4x45W-Amp_W0QQitemZ5847970922QQcategoryZ3293QQrdZ1QQcmdZViewItem
This is the DVD player.

I am posting them all just so anyone needs to know the output/inputs of each unit.

I'd appreciate any help.

Oh and happy new year everyone!

Thanks!
Antony