While posting something, please mention skills level (noob, normal etc). It helps me to explain better.
Make backup first. Rom flashing will wipe phone memory and may brick phone, if done improperly.
A usual procedure is
Using cwm recovery, First rom, then aroma package. Cwm install zip files.
In my cwm 6, I have to use either sd memory card or sideload zip files, as it does not detect phone memory.
Then using Odin3.09, flash bootloader using BL and modem using CP, flashing it one by one would be better. Odin flashes tar files.
Do not expect it to start normally, without completing the whole procedure.
Wipe cache from recovery, if stuck in bootloop.
However, it is more advisable to also read the instructions provided with the package.