The other already pretty much answered the questions, in what I think is the best way. Just take your time, RP is very daunting. Even as a long time RPer, 20 years or so, I still find the aspect of making a character and jumping in terrifying. Take your time. Think of a personality, or trait that intrests you, or just be yourself in this whole new world. Make minor adjustments to fit the theme or setting, like FF14's speech. "Pray, answer me this question," or "I want to become a full-fledged summoner ere long" As basic examples. And as hard as I know it is, try to not overthink. Its a blessing and a curse all at once. Some of my best ideas come when I'm in an idle mind or at work, and very seldom when Im actively trying to think up a full character personality, history, flaws, goals, and so on. For me, when I 'try' to think, I tend to get stressed out by all the different facets that make up a person. Think, you didnt become you in a day. You took years to develope the personality you have now. Make a basic persona, then let time, and other interactions dictate who that character is, wants to be, and becomes~
I'm sure you'll do fine, and same as Shev and SinfulFox, I'd be more than happy to help with questions, concerns, idea bouncing, or some casual RP or banter. Most all the RPers I've met are way too nice of people.
Also, welcome to the dork side~!