That worked awesome on retail, but on private i doubt u can que all day long RDF from level 15 to 80 ( i did that with few char on retail because i had enough of the same quests over and over again, also, blue items non stop <3 )
The time you spend in que you did already 10 levels like..The problem as already said 100 times, is you can't put a 7x (or 10x, or 5x) server exp rate, and leave the drop rate 1x (or worse than retail..because on retail I remember you could actually see many green/blues by killing random ***** bears, and at level 10 you were already with all bags, 6-8 slot, and almost every armor equipped (helm and trinkets were the last and hardest to obtain)).
So, good luck, try to do level 58 fast, once you are in outland things will change and quests will start to give u weapons, armor and everything, same for northrend. Vanilla sadly lacks a bit talking about quest rewards..you should do like every quest in the zone to have a gear that matches with your level...