How do I get started with oauth for YQL for historical stock data?

Question

in my search for a market data feed, I've been led to YQL for yahoo finance. It looks great, and very simple for the public use/ queries, but the daily limit for the public version is too small for my needs.. I got my yahoo ID to get started with oauth, but I can't find any good examples pertaining to what I'm trying to do...

I'd like to "sign in" with my desktop app in C#, and proceed to download data of interest. How do I use the oath dimension? My background as a point of reference is simple screen- scraping with the html agility pack, I've never had any experience with web services. Can anyone get me started. I'm stuck at the moment (and have been all week on this). Thanks in advance...