Is this just to build a portfolio for yourself?
Probably yes, of course i want to get paid, but for now i will offer it for free.
I offer non-free version too in thread.
TBH, I've been thinking about doing the same sort of thing. No idea how you exactly "get started" with campaign managing (IE: getting that first client)
Either way, I'd put a link to this thread in your signature, and hopefully someone may take the chance on a lower risk campaign.
Good luck!