As a long term casual wow player, yes I've found it possible to enjoy WOW for years without getting sucked into life controlling end game raiding, I'd suggest:
1. That the free trial is awful, a level limit of 20 means you'll hardly get to experience dungeons and playing as a group, and no Auction house access cuts out the financial side of the game too. I understand why the limits are there, but it could be far better than it is.
2. That sure, the graphics are not technically brilliant, but they have an artistic style that allows it to still look fairly good while actually being playable on a 5 year old PC, so long as you've got 2gb+ of memory.
3. That it's not all about end game, at least not for everyone. Many people have different ways to play, and enjoy different aspects of the game, and it's quite possible to enjoy the game without devoting 5 evenings and 40 hours a week to it.
4. I'd get in now, before the next expansion, so that you can truly appreciate what the expansion will bring. I personally think it's going to be really interesting to see the chaos that Cataclysm will bring to all the old low level zones, and it wouldn't be the same for someone who didn't know how it used to be.
5. As someone else said, find a casual levelling guild, where you won't get idiots abusing you over your gear or level or 'newbie'ness. I personally find 'lol noob' one of the weakest insults ever created, and it's one of the most popular. To me it translates as 'lol you've spent less time in front of the screen than me' is all. Of course your friends can probably find you a space, and maybe even make an alt and join the 'recruit a friend' scheme with you, for bonus xp and a free mount each!
6. My personal opinion is that race doesn't matter, the racials are minor buffs really, so go for something you like the look of, as you'll be looking at it for months to come, same goes for picking a name, 'lolilikepie' might seem witty now, but you'll regret it when you've invested months of gameplay into making him an epic hero, honestly, I've seen worse names, like smellybum and istabyou and orcwarrior.
7. I'd say it's worth trying a class to 20 before giving up, as most classes have something interesting going on by 20 and it's fairly quick to get there. Also, trying each class means you have some understanding of what to expect when you're teamed up with them.
8. Money, I imagine your friends will dump some cash on you to start with, but if not, mining and skinning, and auction off all the stone, gems, ore, and leather you find.
9. Don't go deleting characters unless you're sure, and keep at least one as someone you can mail stuff to. It's often easier to find a mailbox than a bank, so leaving someone at a bank that you can mail stuff to is an awesome time saver!
Also , blatant plug, if anyone else is in Europe and considering starting, we welcome all comers on Agrammar in the Sunken Temple Pilots
