Here is some tips if you do try out Classic:
1. Make sure you pick the right server. Sounds stupid I know but people make mistakes because they rush trying to get to character creation. So if you are not into PvP make sure, absolutely sure you pick a PvE or RP, if you enjoy role playing, server because on the PvP servers you will get ganked by the other faction in the contested areas while trying to level.
2. Know which faction/race/class you want to play ahead of time. In Classic there race and faction restrictions on what classes you can be. Want to be a Paladin you have to play Alliance, if a Shaman you have to be Horde. If you want to be a Druid you are restricted to Tauren for Horde and Night Elf for Alliance. There is plenty of guides out on the web but I recommend WoWHead.com as the place to check out first before making a character.
3. Hunters are the easiest and fastest class to level in Open World questing and grinding, but are almost universally hated in Dungeons and Raids due to their pets. If you play Hunter and your group wipes in a Dungeon or Raid it is your fault, no matter what happened.
4. If you make a class that can heal, groups expect you to heal in dungeons so that means if you make a Priest, Druid, Shaman or Paladin they expect you to heal not DPS even if you are wanting to play the DPS specs of those classes. In cases of the Druid and Paladin, they can tank instead of heal but are not the best at it.
5. If you make a Warrior expect to be the Tank in any Dungeon you do and spec and gear accordingly.
I don't recommend Warrior, Druid, Shaman, Paladin or Priest as a first toon if you never played Vanilla WoW and it doesn't matter if you have played the lasted expansions because the gameplay is completely different. I recommend as a first toon a Hunter, Warlock or Mage because they are easy to level and two of them come with their own "tanks" since they are pet classes (Hunter and Warlock) and the Mage has a ton of CC and is surprisingly survivable when questing.
I currently play on the Kirtonos server, Horde Faction and you can look me up when I'm on, if you roll Horde and an East Coast PvP server, under the names NocteYin, Triana or Keritanima. That's right I named my Druid Triana and my Mage Keritanima
