MmoGah will share a guide for the faction change on The Burning Crusade realms with Warmane players. You can spare one minute to read it.
Faction change is irreversible and not eligible for refund.
In order to change faction, first of all you will have to create an alliance character. This character will be used only for race, name (you will be able to change it later) and appearance. Anything else (gear, reputation and so on) will be swapped and converted from your horde character.
Steps bellow should be done after you created an alliance character:
Step 2. Select the realm (in our case Outland), after that select your horde character which on you want to transfer and select the currency. On the next dropdown select the "Faction change".
Whole information about this article please check:https://www.mmogah.com/news/warmane/warmane-guide-faction-change-on-the-burning-crusade-realms