Nexus has to fight ragers. As a newbie, that's not advisable imho. Fort is also very easy to get into, and for an acolyte path doesn't even require anything. For squire, you only need to kill one evil guy. Not sure that can be waived and you're somewhat expected to sort of pursue evil. Not necessarily be good at it, mind you. But the upsides are huge:

1) Easy ranking, especially considering the fact you're an uber tank 1-51
2) Everyone in Fort is good, so lots of free trips/gear, and no one can smack you around without breaking RP
3) Hide and Vanish. When things don't go as planned. For latter, smoke and mirrors edge and you don't die unless you want to/have to
4) Lack of natural enemies. Empire and Scion are not that strong, others don't touch you. Just make sure to ask nexuns what the balance is from time to time. Moreover, if you're newbish, they generally won't actively pursue you even if the balance tips to the light.
5) Good PK ability without really trying. Kot and Kans, spice up with kicks, built-in healing

Race is your choice, but I'd really suggest arial for newbie - easiest to play with and the downsides are generally irrelevant if you're new.