Working in the UDK might seem like a good idea now, but there'll be a ton of royalties to pay later on! If I may suggest an engine I would heartily recommend Unity 3D, since it is Free for basic use and has a licensing agreement which allows you to make a couple of before having to pay 10% of your revenue to them.
Also, and this is most important for your marketing. Have you any past projects to show off, anything to point to that says "I know what I'm doing"? it would make your pitch far more believable and trustworthy for "investors", if you can convince them that you have done something of equal magnitude of what your trying to do now.
Lastly like Camomano99 said, If you haven't gotten any work gone on the actual game you're proposing, you shouldn't be posting about it. wait till you've tinkered with UDK or whatever engine you decide using and once you have something playable, post here and everywhere you can saying; "This is my project, here's a demo / a youtube video and if you would like to see it completed please help out, by either joining my development team or donating a little money for me to get the assets for the game."
