I haven't the foggiest on how to use AdWords well...best to hire a consultant or are there resources people would recommend?

I have a burgeoning edtech SAAS startup (http://ift.tt/1cKxTyz) and I'd like to start using Adwords, but I don't know much about it. Is it better to hire someone, or easily learnable? My concern re: a consultant is that I'm only thinking of spending a few hundred dollars/month on Adwords, so I don't want fees to overwhelm any benefit.

If I should learn myself, can you recommend your favorite resource to learn Adwords?

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