Enjoy the experience, it's awesome the 1st time.

My advice is rather get window seats opposed to the middle adjoining seats. This goes for both the A380 & the 777-300

Also, regardless of which gate you fly from in DXB, use the first class lounge located by the "A Gates" - much nicer than the others. As you enter the lounge past reception, you can turn left or right - they're almost a mirror image, but turn left, better overall.
There's a "quiet lounge" with recliner sleepers if you need a kip.
If you intend showering in the lounge, get the attendant to write your name in their list when you arrive so you're 1st in the queue when you're ready to shower.

Lastly, they serve HAGEN DAZS ice cream in the lounge on request.

All the best