EQ2 is not like EQ1. Treat it as a different game and you should be alright. I played both, and while EQ1 will always have a place in my heart, I really enjoy EQ2 much more now that the majority of the kinks are worked out.
The classes are a bit different from EQ1. For instance, a Monk or bruiser, is considered a tank class, not DPS. There is no kiting ability in the game, so if you plan on trying a necro or druid, know its not the same.
Each class actually has something to offer to groups and raids. There is no best class to play or be. And any race can be any class. Some you may have to betray to get there, but it gives more variety.
Once you hit level 10 you can start earning AA's just like in EQ1. There are two branches, one for your general class (Druids/clerics/brawlers/scouts, etc) and one specifically for your class. You can tweak your character to offer different things depending on where you spend your points.
Lots of solo content has been added. While EQ2 still offers more for groups, you do not need to have a group in order to level. You also do not need to have the "perfect" group in order to achieve anything.
Read the quests, play around with your options under Alt O, and enjoy!