please can you help a newb out

he guys im new here ..made wow server today but i think i followed a old guide...im patched to ver 2.1.1..so i was wondering...

1.>whats best core and database atm as i think mine is old, and i would like to just play with a couple of my friends ...but this database and core i got, i think the quests dont work...so if anyone could please point me in the direction of a good database and core that would be awsome for me...thanks for your time guys...