1) Nothing is going to get you a real 1080p picture from your laptop if it can't display that resolution, period. You may be able to upscale some other resolution to 1080p, but your laptop will still be running in some lower resolution.
2) You'll need to hook a 1/8th inch (3.5 mm) cable from your laptop's audio out/headphone jack to the Audio (RGB/DVI) jack on your TV.
3) Pretty much any cables will do what you need. No real need to get pricey cables. You can probably get the Audio cable from Wal Mart or some other similar retailer for about $5-$10 (and from the sound of it you already have a VGA cable that works).
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