re: selling shares, you could use one of the "cryptostock" services, such as for example:
https://bitfunder.com/market (which seems more mature than cryptostocks.com). You will probably also want to come up with your own mining pool.
If there's any way to hold back payment, do only a partial upfront payment or ideally use escrow, I'd seriously consider doing that.
http://bitcoin-square.com/kncminers-paypal-trick/http://bitcoin-square.com/update-on-kncminer-the-question-remains-is-it-a-scam/Anyways, good luck and please do keep us posted!
PS: Your first name in the eMail doesn't match the one shown by Yahoo, just pointing it out, or people may be wondering if you're legit or not