I guess I'll settle with Half-Orc Barbarian.
Hi, I'm that meddler that DP mentioned, D&D is actually allot trickier and allot easier to handle than most people realize. I'm always up for a game or even just helping people figure out the ropes. Half-Orc Barbarian is a good starting char... if you like getting beat up, being the but of everyones jokes and dieing. As many deaths at the hands of my first DM (which stands for Demented Maniac) showed me. Don't get me wrong Barbarian is a powerful type and very useful but they tend to be the guy taking the most damage at best and even worse being controlled by evil spell casters to frag their own team at worst. Is this the type for you?
When choosing a first character you should pick a class that you can identify with. It's easier to be a valuable team member when you understand what you can do for them and what they can do for you. No one can be good at everything and everything has a weakness which is why people form teams in the first place, so saying the most powerful is meaningless. Not to mention their are professional jerks like me who live to humble god-moders. If people want I will help them chose a class, abilities and team working skills that will help any team survive. It starts with us talking about attitudes. This is the foundation for some of the rules of the game and the best place to start understanding what is going on.
Another key thing in starting a character in any campaign is knowing how much fighting versus interacting with others the team will have to do. How much will the DM change his plot to suit abilities of the players vs how much the players have to have the abilities that the DM wants. The DM also sets the level of the campaign and this can have a huge impact in how you design and develop your character. So the real question right now goes out to the DM, What level are you planing on playing with? Is their a start to the story? Is it going to just be battles and catch phrases for the first little while?