Nostalrius Begins - Quality wow vanilla realm (1.12)

I've always began playing on Alliance for as long as I can remember playing on retail. After leveling my rogue to 30 i decided to make a Horde warlock. But as soon as I tried playing I began noticing complications.

After reloading 4-5 times, re-creationg my character 2-3 times. I accepted that the creeps on that character permanently dodge/ ignore my attacks and heal themselves. Any help?