It sounds like a nasty experience.
At risk of teaching grandma how to suck eggs, always get legal advice before signing anything that you don't understand. Companies are very good at writing contracts that are extremely one-sided, and deny all liability.
The other thing to bear in mind is that what's promised when someone is selling an opportunity doesn't necessarily match what's on paper. And if the two differ, it's the contractual version that has legal standing as this is what you've agreed to in a binding manner.
So if they tell you that the site will cost $270K, you will receive quotes from three fitters, and that it will be open in five weeks then you want those in the contract itself.
I had a bad experience doing a piece of software development work a few years back. I was promised money upfront, agreed a basic spec, and so forth. It was for a mobile phone game, and I massively underestimated the work needed to convert it onto different handsets (the technical version is that the J2ME platform was highly fragmented, so write once run everywhere doesn't happen). However, the time scales I was working to were those given by them, and they should have known they were optimistic.
Oh, and the payment scheme was based on royalties that took a small percentage of the total revenue after the other company had taken their expenses (undefined), with no upfront payment for myself. Oh, and there was an offer of money to complete the project made in my discussions.
The end result was that I spent a lot of time over a twelve month period working on what should have been a couple of months to finish on the original estimates. I was threatened with everything from non-payment through to being sued to recover their losses. I ended up handing the assets over and telling them to finish it themselves.
Subsequently I learned that any serious software house would have charged around $100K to do the job, and I'd have been lucky to see more than a fifth of that. The company was renowned for not paying unless they were threatened with legal action. And I wasn't the only person to have gone through all this - I spoke to another victim during an interview for a role at UBS a few years later.
Had I been a bit cleverer, I could have pushed the original one sided contract back to the other company and told them to come up with something a bit more even handed.
In Hysteria's case I'm guessing that it was the same mix that I had of being inexperienced in business and dealing with a pack of sharks.
One question for the OP: Are you planning on starting anything up again?