Connect 2008 MacBook Pro to 2012 MacBook Air wirelessly home and away

Hi there,
I have a mid 2012 MBA, which I like, but the hard drive is, of course, already full. I use DropBox with selective syncing to try to keep enough memory free to run programs on the MBA. I also have an early 2008 MBP, which is connected to the DropBox, as well. I sync all the DropBox folders to this computer because it has adequate storage. Both laptops connect wirelessly to my home network. Both are running Mavericks. I've managed to share folders across the two devices, but what I'd like to do ideally is have the MBP function as remote storage, the DropBox function as the backup, and be able to access everything remotely from the MBA, whether I'm working at home, school, or work. In other words, how should I configure the laptops so I can access everything from the MBA without clogging up the memory and running slowly? I'd also like to use the MBP as a second display for the MBA when I'm working at home, because I was stupid and purchased the 11" MBA.

For a 2010+ MBP you can connect with a Displayport to HDMI, which will include Audio.
With older MBP you will need a displayport to HDMI, if you want audio to the actually TV, then you will need to get a cable with either digital out from MBP to the HDMI, or USB audio mixed into the HDMI
eg
http://eshop.macsales.com/item/NewerTech/CBLMDPHDMID/

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    Hardware Information: ℹ️
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      1 2.9 GHz Intel Core i7 CPU: 2-core
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