is ur phone unlocked so that u even have the possability to flash a custom rom?If u havnt unlocked the phone yet then flashing it will be impossible.there are plenty of threads and posts that will tell u how to unlock ur phone.If u want to check and see if its unlockd then try to get the phone into bootloader mode by powering off ur phone,then hold down the volume down button and then push down on the top power button until a tri-color screen appears.if no tri-color screen appears then the phone is most likely still locked.For most first time rom flashers i think that flashing from the sdcard is the easiest to do.in my opinion.first just use ur PC to download the rom u want to try,2nd using winzip extract the .nbh file from the rom and copy it to the root of ur sdcard.Then rename it to RHODIMG on the sdcard then just take it fom ur computer and insert it into ur phone when its turned off.Then,if ur phone is unlocked,after u insert the sdcard then put the phone into bootloader mode.(phone off,hold down volume down button,thenhold down power button)if it workd right then u will get the bootloader screen and that will change to a screen that will say to update press power button or to cancel press volume down button.push power button.then when its all done doing its magic.then do a hard reset to purge any leftover files or anythn els left over from the previous rom.i even know of 1 local technician that always flashes a phone twice,i dont know why,but he swears by it.