I generally just makes rules for myself that pertain to roleplaying my character. For example, if I'm playing a noble who served as a diplomat for his house before being mindnappeed,i'll probably attempt to talk my way through as many problems as I can, and try to make potential allies everywhere I go either for potential power or oppurtunity. Another thing I try to do, is not rely on metagaming, and instead rely on my characters own knowledge and instinct. An example of this, would be I know there is an ambush ahead, but my character, nor any of his party members, suspect anything, so I am going to walk into that ambush and deal with it accordingly despite my knowledge as the player.