The first leveling guide for Rift I came across is Killerguides Rift Leveling Guide. It's overall a decent guide, but in my opinion needs some additional work to be great. However, considering that their guide is in "beta" just like the game, I do think it's worth getting as it will receive many updates in the coming days and weeks.
Here's a short summary of the contents in Killerguide Rift Leveling Guide:
leveling guide for all races, classes and factions
platinum (gold) making guide
instances (dungeons) guide
There are several more chapters, so be sure to visit their website to see a more detailed list, or just go ahead and download the guide. It's a good read and will help prepare you for your Rift adventures better than most other fansites and guides will.