In the first situation with the King on the board, with no reads, it is usually correct to fold to the checkraise. In the second example on the ten high flop, the standard play there, with no reads is to 3 bet it. Keep in mind that the standard play is not always the best play, just trying to point you in the right direction. It sounds to me like you have much to learn, so make sure to buy all the limit two+two books and study them hard, and keep playing the game and thinking about the game, and keep posting on this site, and reading other people's posts.