Actually, I've also got the UnReal engine at home. But maybe you want to read the samll print - you know, the documentation you clicked "Okay" on without reading when you downloaded it. It's an educational tool only. The UnReal engine can't be used for commercial products unless you buy a single-use development license. That'll cost you:
Quote: "A non-refundable, non-recoupable license fee is due on execution of the agreement. The cost is US $350,000 for one of the available Unreal Engine 2 platforms, plus US $50,000 for each additional platform. A royalty of 3% is due on all revenue from the game, calculated on the wholesale price of the product minus (for console SKUs) console manufacturer fees. In the case of massive-multiplayer online games, the royalty is also due on the additional forms of revenue including subscriptions and advertisements."
I doubt that's within your budget, considering you're touting for free media. Myself, I currently suck at modelling. I contribute to this forum by purchasing other people's work, be it model packs or applications (magic fps, signs 3 etc). If you CAN afford the UnReal license, good on you - I think you could then probably stretch to purchasing the products of those who have the skills you lack.