25 quests can be a lot of XP quite quickly. If you're racing for the first zones, (and there will be many who are) then you'll want every edge you can get. WowWiki has a decent list of available daily quests. Be sure to empty your quest log before starting, and pick up as many as you can. Try to avoid the ones which give low cash and XP as a reward.
Then, park yourself in Ogri'la and await thursday's arrival.
Now, the servers come up, you've upgraded your account and you can complete the quests in the following order :
After that you should head back to shattrath and take the portal to whichever city has the zeppelin or boat for your faction. With minimum travel you should be one of the few people on the island to reach level 71. Not good enough? Alright, then have a grab at this leveling guide to get you trough 70-80 even faster!
As you can see however, that's a grand total of 25 quests exactly. There are plenty more quests, some pay more, some less. Group quests and raid quests especially should be savored. Just don't go out of your way to turn them in and most certainly don't waste any time completing them on the actual patch day. After all, you want to start with Northrend as soon as possible.
Low xp quests : Avoid these if your quest log is full.