If it were me you were trying to shomooze,
I would want to know:
- Problem you are going to address
- Where you think the money is going to come from. (Ads, Users, buyout etc)
- Addressable Market size, don't say millions of people, say we think we get to 3,000 in the first few months.
- Your expected growth pattern (1, 3, 6 and 12 months) how many users, how much money.
- Say you have a first cut on the screen designs and you would like their opinion after you sign an NDA.
I wouldn't worry too much about them stealing your idea, technical partners have a lot of options and there is far more to addressing a space than simply some wireframes.
Things like marketing, sales, business management and all the things the tecnical guy is less likely to know about or be able to do without you, much like you can't develop withoput them ... It is partnership because no one can do it on their own.
Any good CTO will already be able to fill in 80% of your wireframes after a little discussion assuming they know your space, and a week later after some research if they don't. If you have wireframes already a technical partner may want to redo a reasonable amount because they will know stuff you don't and the negotation is the bit your hiring them for.
What they should ask you:
- What is the business model?
- How is the company structured?
- What is the revenue model? and then say have you considered X, Y and Z as alterntatives.
- What are you offering me? Shares and pay. The answer should normally be milestones aceheved, you get more of your shareholding up till the total amount (around 20%)
- How much say to do I get in the process? Do I get to build my own team? etc.
If they dive off into technical stuff like hosting on Amazon or Azure using .NET, JAVA or Ruby, then this is an indicator they know their tech but don't understand business at all. Your risk here is them going off to develop horizontally scalable, self-replicating, auto-healing architecture.
You need to make a call about can you work with someone if you can't communicate to them.
Really, you want someone who will challenge your ideas, make you think about alternatives but be gracious in defeat if you still want to stick to your vision.