If I had to start over completely I would start up 5 RaF accounts and level them to 60 solely in the old world instances. Get all the quests for each one before you go and you will only have to clear each instance once or twice because of the RaF xp. It's not as fast as boosting but it is so much more fun than boosting or questing. It will give you great boxing experience so you wont have any problem when you get to the newer stuff.
I suggest you start the rest of the trial accounts to have 5 total and quest to about 13. At 13 you can run RFC for some fun and learning how to do all the tanking/dps/healing yourself. At 17ish you can do wailing caverns and deadmines and around 18-20 you should be able to do shadowfang keep. You'll be able to do all this without paying anymore at all. You can go to Org or IF during peak hours to see how you computer can handle 5 accounts. The only place worse than those areas is dalaran.
I think your computer will be fine. I ran a worse cpu with 4gb ram and a 1gb ram vid card and was fine everywhere but dalaran.
And remember when you buy 4 new vanilla wows you get 4 free months with them plus 4 more free later from the recruiting.
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