Falconiano
Prince
Babylon is auto-win, go for it.
Shoshone gives you a real decent advantage early. It allows you to make mistakes whilst you are learning. I'd say it's the most newbie friendly.
I feel like if someone started laying Shoshone, they would never be able to get off the ground with any other civ, ever. I would agree with Babylon being a solid, simple choice.
For a beginner going Diplo, yes. Tradition is very easy to take advantage of, and gives you lots of free things, very good when paired with freedom.
However, once you get bored of tradition opener every game, try toying around with Liberty. All of my Immortal wins are with Liberty opener thus far, and I've won with all 3 ideologies.
when i picked Shoshone as my first civ it sort was 2 easy and i got boerd pretty easy at early levels
why is Babylon good
Early Academy. Since I assume you're playing on lower difficulties right now the interaction with the Great Library is also quite nice. The only civs that compete with Babylon in terms of tech (and tech is pretty much everything) are Korea and the Maya, and I think someone crunched the numbers at some point and concluded the early benefit Nebs gets is never outdone by the later one Korea gets.
so i should focus on science and patronage to get a diplo?
Early Academy. Since I assume you're playing on lower difficulties right now the interaction with the Great Library is also quite nice. The only civs that compete with Babylon in terms of tech (and tech is pretty much everything) are Korea and the Maya, and I think someone crunched the numbers at some point and concluded the early benefit Nebs gets is never outdone by the later one Korea gets.
Since you're probably going to play on an easy difficulty, you need science because you need to reach the information era to even unlock the diplomatic victory.
And to actually win the diplomatic victory, you need patronage to get city state allies, as unlike in other games such as MMO, everyone just votes for themselves and the civ with most votes wins.
Start at Emperor then. That's about the point where wonders stop being things you can take at will and become something where you strive for a few specific ones that directly assist your victory (and even then not always; as much as Nebs love the Great Library the AI loves it too and will almost always pick it up before you if you don't sacrifice everything to get it).
Commerce and patronage are the main ones you'll want for a diplo victory. Rationalism (science) is also useful.
For a civ, I'll echo what others have said with Poland, Egypt and Greece. Inca, Maya and Ethiopia are also pretty good, if a little more specialised.