This brief guide is posted to help those returning to EQ and struggling to level through the 60's. I am sure there are better places than PoF to level but I love this zone and post this to share what I have learned.
You must be lvl 60 to enter PoF and when you zone in be sure to locate the tree that is the zone out just in case you need to get out fast. Pulling to the zone in is relatively safe, but in this zone it is easy to get adds out in the fields because the trees hide nearby mobs. Typically I like to stay at the zone in until 62. If you are a kiting class you can go behind the zone in area to a little valley just over the hill behind you that has no spawns and no roamers... perfect for kiting red con mobs. Your merc tank will struggle at first and you may have to take some agro to keep him alive.
At 62 invis up and levitate over to what is known as C1. You will need to run up as high as you can on the hill at the north end of the first wall and run over to the top of the wall. There is a mob there that is static and I typically go down the stairs there and set up behind the stairs in a little nook with a mob there. The agro radius of the fire guys and efreeti's is very very small. You can single pull this wall and the only adds you will get is if a roamer walks right through your fight. Clear the lower level of the East wall of C1, and even the 2 at the south end that are spawned right together will single pull. Continue up the stairs at the south end and clear the top wall back to where you started. You should get a level each time you clear it. One note - you cannot zone out from here. Once you lev over to the wall it will not let you jump off the wall and run to the zone out tree. Gate/Origin/Throne required to get out so the single pulls become more important to melee classes without gate.
Up top is a bridge that can have a raid mob at the center named General Douchebag Flamesong or something like that. If he is not there you can single pull all 6 of the mobs up on the bridge for even more kills and work your way through the west wall of C1. Down on the floor in the center can get a little congested with multiples on pulls. There are a few safe single pulls if you work your way around the floor area. At 66 I was getting 2% per kill with pet and merc which is pretty slow, but keep in mind that xp slows way down by the time you get to 70. The days of racing through levels is over at this point (as intended). Try to use Lesson of the Devoted if you have it, or grab xp pots from the DB store to help with the levels. You can stay here until 68 but at that level you have to clear the wall 4-5 times to get from 67 to 68 even with Lesson.
After leaving here at 68 or so your merc no longer can tank mobs effectively. Unless you plan to play healer to your merc the fighting style of most classes will change around level 70. If you are a melee class that can take a little punishment then a healer merc will be the way to go. I leveled up a rogue to 105 which is good dps, but horrible at taking hits and has no slow. The healer merc kept him alive most of the time and the bonus xp from dailies, DH HA's, quests, etc got him to 105 but it did take a considerable amount of time.
If you are a good kiting class you are better off with no merc because they do absorb xp. Grab a healer merc, unsuspend it so you get the cleric buffs for you (and pet) then suspend it and kite. Where to kite? That is a tough question. Leveling from 68-72 is one of the harder level ranges to level. Once in the 70's more zones open up with daily quests, daily hot zone quests, etc. that are good xp. It is at this point that you have probably learned the class pretty well, and realize that you dont really need 40-50 hours of more practice with the class just to get to 85. Purchasing the heroic upgrade to 85 is not a bad idea here. Spend a day or two adjusting to the new spells, pet, merc, etc. and play the class from 85-105. I like to do this because it really can be fun leveling from 1-70 with any class you want to play. And if you discover that you still really like the class at 70 then getting the upgrade to 85 saves you many hours of grinding/questing on your way to 105. And you get all of the level 85 and below AA's auto granted which makes for a pretty powerful level 85 toon... which is once again fun to play.
Hope this helps folks coming back to the game.