Tazinas

Hey, I started on this server 2 days ago and I'm currenlty level 16. I'm new to vanilla and this is the first server I play on. I'm following the Vanilla Guide / Joanas guide but I feel like I'm always lacking behind half a level ish. Should I just grind if I'm missing some experience? Should I go questing in zones which are not in the guide, e.g. silverpine forest to get a headstart and then continue with the guide? Thanks in advance, Taz~

Yes, I already got it. And I'm not a retail baby. I quite like the way vanilla is so far yet the reason I started to play was to experience the old 40 man raids, 25 heroic later on etc especially Naxx 40 which comes 2018/09 if the timeline is accurate. Also, a more specific question about hunters. I leveld with a boar 10-13 and tried a cat after. But the cat can't hold aggro, so after I start attacking the mobs always start running towards me. Should I tame a boar again or should I kite with concussive shot / wing clip?

Alright I stopped using this guide. I'm level 17 now and there are only quests lv 19-20+ left in the barrens. Should I try and complete these or should I go to another zone until I reach the proper level? Also, I tried Questie before and it turned out that it displayed the level of the quest inaccurately. It showed like 23ish but when I got there the mobs were at 16-17.