I would hurry and preorder SoF, thats all expansions + a bonus kind of SoW clicky item.
About flagging; If you join a guild that does PoTime, then there is a backflag item, so don't need to worry about flagging there. No backflag to Tacvi, but if 85% of the raid is flagged you can join them anyway. For CoA you will need to camp 7 signets and turn them into an npc, then you can can get into CoA, where you can loot a backflag item, that will make you able to loot gear in CoA.
See the quest for signets here: http://everquest.allakhazam.com/db/quest.html?quest=2978
Joining a guild doing DoN wont require anything from you, except you might want to try and do the questline yourself, there are some pretty good rewards there. Demiplane of blood is another story and it will require lot of work to join a guild, that has this as main farming zone. Same kind of goes for Deathkneel, there you can get backflag item, but you will need ToB access to be able to get in with the 85% rule anyway. Tss is actually quite easy, you can join a guild doing tss without doing anything, due to the 85% rule. Tbs is another matter, here you will need to do 8 group missions to be flagged for Solteris.
Hehe now I have rambled on about much that isn't realistic, when looking at your level and possible aa's/gear. ;)
If I were you I would try to get the 7 signets camped for CoA access and join a guild that has CoA as main raiding zone atm. I don't know guilds on your server, but there is likely one. Then just follow that guild's progression and see if their progression speed fits you. Might want to join before getting the 7 signets, because you won't be able to solo them.
About soloing: At 66 there is only Plane of Fire to quad, imho. But there are some nice zones in TSS like brownbear mentioned, you can try The steppes, but would recommend not trying to quad, but rot, snare, nuke and have the mob follow you around, while you nuke it from safe distance, while keeping it snared. Thundercrest Island might also be worth a visit and if you can get group, then doing the socalled Nest missions in the DoN expansion is good exp too and will earn you some Crystals, that you can buy some upgrades with. Anyway check Library and forums over at http://www.graffe.com/
When you get to lvl73 and especially 74 you will get instant nukes, that will change your solo abilitys forever. *BIG SMILE*
Please ask, if some of what I've written require more explaining or lead to more questions.
Edit: Would make it easier making recommendations, if you could link magelo profile or at least say how much mana in your pool and perhaps number of aa's. Edited, Nov 1st 2007 9:03pm by Grokl