Affiliate Marketing Secrets

I’m 22, from the UK, I have nothing but high-school GCSEs (B-Cs) and some college education.I was recently made redundant from a retail job, due to the current economic state here in UK, I don’t believe I’ll be employed again any time soon.
I’m seeing being unemployed as a mixed blessing, I have little bills to pay, live at home with parent, so lots of spare time on my hand.
For the past 6-7 years I’ve been studying Web Development. I’ve become more than fluent in XHTML/CSS, javascript, PHP, Mysql relational database design, SEO, typography, regular expression, and lots of other stuff, I’m a master at none but >= fluent in them all 🙂
I’ve only ever built sites for fun or stupid things like blogs or messed about with APIs such as Facebook and Amazon, yet now I find I have an opportunity to make a hobby a job. Question is I have no experience as an entrepreneur except maybe marketing/SEO, so I do not know where to start, I have no niche site idea, haven’t got lots of cash to spend on marketing, no products… I have nothing to offer users but fancy blank pages… not exactly king content!
So where do I start? 🙂
Kind Regards
Mike