No worries, we're all noobs at some point.  I'm currently working on something similar as a side project (doesn't have the bulk aspect though, just setting up a personal system to keep tabs on certain link targets via url-metrics and recording/comparing aggregate results over time).  I'd say your best bet for finding someone would be here - whether that's allowed, I don't know either - or maybe even just source a hungry computer science undergrad at your local college?  For someone well-versed in PHP or similar, this probably wouldn't take more than a few hours of time spent coding.

You'd need to provide them with the SEOMoz API documentation, and also follow the basic steps here to generate the credentials for your account:
http://www.seomoz.org/api

And also, I'd start by digging around in the API Wiki linked at the bottom of that page.  Lots of good writeups for making basic API calls and such, sample code, etc. You can even make a basic call with just a web browser if you'd like to see what kind of data you get from the API.

If you have some basic coding skills (or even just a decent grasp), I would definitely go with the free API.  You can pass the url-metrics API all your URLs in bulk via PHP and return page authority for each.  I'd go into more details, but SEOMoz has some pretty good documentation already:
http://apiwiki.seomoz.org/w/page/13991153/URL-Metrics-API

They have a cap at 1mil URLs per month, so hopefully your definition of "bulk" doesn't exceed that.