Unbranded PPC6800 converted to Alltel.. HELP!!!

[ashgfu]

OK everybody, before I start, I know I'm new here, and I know how forums usually treat noobs, so please just ignore this and help a guy out.

So heres my story... I've recently purchased a PPC6800 and need some help setting up. This particular phone has no carrier, as it is straight from HTC. That means it has none ofany carrier's stuff on it.

Now here's the issue - I need to get the phone running on Alltel. I need to know what I need to tell you guys to get me what I need, and I need to know what updates and downloads I need to put on the phone to make it work on the Alltel network.

Here's what I know: The phone works on the CDMA Network, but the seller tells me it does not support EVDO. I've read around the forum and have seen all of this talk of upgrading the ROM, whatever that means, to support EVDO, and switching from WM5 to WM6 in other carrier versions of the phone, but I need all of this info given to me in an easy understandable guide that will help me get going. Thanks everyone!