attempt to explain the basics of
role-playing. Role-playing is exactly
what it sounds like, playing a role. You
don't have to talk with "thee"
and "thou" if your character
doesn't do that.
In all the movies you go watch, the actors are role-playing, they are taking on the characteristics of the character they are playing and they become that character.
The first thing you need to do is to figure out who and what your character is. Here are some things that you want to consider:
If you choose to role-play a murderer, do so. All murderers have reasons for killing the people that they kill, whether they are insane, or perhaps they don't like the color of the person's shirt. If you choose to be insane, do so, but then you have to kill everyone, you can't make exceptions for your friends. If you choose to kill for a reason, choose one or two reasons and then don't kill people that don't satisfy those reasons.
Always try to role-play your character as accurately as possible. If he was raised in a Trinsic slum, it is improbable that he was educated very well and would not use "thee" and "thou" in conversation very well. They might say "yer" instead of you.
If you choose to role-play a bandit, do so, and demand that the person give you something or die. If you kill a newbie that does not respond to your request for an item, that is legal to kill them. If they don't have what you want, don't kill them. You may snoop them to see if they are telling the truth. Just respond as you think a bandit might.
Your character wouldn't know what his strength is, he would just know that he is strong enough to equip plate for example. And he wouldn't know his skills either, he would just know when he is good at something or not. He also wouldn't know what skill level he needs to create a certain potion or to craft a certain armor, he just would get a feeling that he can accomplish those tasks.
The thee and thou language is something else that most people don't seem to understand. "Thou" is used when the person is performing the action ("thou givest", "thou dost"), and "thee" is used in any other circumstance ("What did he do to thee?").