Root Help with flashing new rom

[dolbydan]

Hi all, trying to assist someone with putting a custom rom on their magic, unfortunately its different to doing it to a desire, which is simples.

Looks like first thing is to root, found on xda the 1click root program, is it needed/the best way?

Found a stable modaco rom, how do you literally flash the rom, I used the htc program (anyone have a download link) for my desire, does that work or is there a better way?

Thanks in advance.