Over the years we have sat on both sides of the fence and had a lot of different offers ... all of them have been custom development for a specific niche market.
Easier question (for me to answer): How to get good technical staff...
If they are more junior staff then have a good lead and mentore that will give them enough leash to try but feel comfortable that they can reel them back in without significant project impact (I have 5 guys who can recover something fast which really helps).
Convincing people to invest: Well there are a few play book answers but really its much like engaging the developer above. This is a journey, at the end of it if we get it right the rewards are going to be lots of money but along the way ...
All of this will result in a $ figure range you need for 6 months, 12 months and 2 years. You have minimum threshold you need to get to make it viable in the first place ... if they want to commit to $X then you will need another 4 investors ... if you reach the threshold then they are in.
That is the basic pitch / plan they want to know, and they will ask questions around their own specific areas of interest.
The other main thing you have to answer in their heads is: Why you? Why your team? what is your background.
The best podcast to get a real understanding of what is required is this week in startups. I would start with some of the earlier shows which were a little more adhoc.
There are plenty of sites now that make it easy for you to find someone. I recently was in the same boat, and I found an investor that also knew a lot about how to get in touch with technical talent as well to put our idea through to fruition.