1-My daugher is crying because we have to leave the kiddie rides, so I tell her
Everythinh has an end! This is fine since everything is in present tense. You just misspelled "daughter" and "everything."
2-Get down the stairs you're gonna bump your head! This is also correct but can be more clear if you add "if you fall down the stairs."
3-Sit down onto this step (of the stairs) This is correct but we would use "on" instead of "onto" where I live.
4-Wipe your feet (with shoes on) on the carpet before coming into the store/house/etc... It would be more natural to say, "Wipe your shoes."
5-Stick with me! Correct
6-Stick around baby! Correct
7-Get back / Step back / Back up ! All are correct.
8-Shut or close the curtains? Either one is correct.
9-Stop whining for nothing! Correct
10-There ain't nobody here! (or anybody?) Since "ain't" is a slang contraction for "is not" or "are not," "nobody" is the correct choice.
11-I don't know nobody here. (or anybody?) This is what is called a double negative. Two negatives make the statement positive. So you would actually be saying "I know somebody here," if you use "nobody." So in this case the correct choice would be "anybody."
12-Would you say : I run out of money or I'm broke (to my daughter whom is asking me for money for the carousel?) "I ran out of money or I have run out of money are correct here or you can also say, "I'm broke." She may not understand "I'm broke." if she is very young, but then they also don't understand the concept of money. So it isn't important which you choose.
13-How dare you to snoop into my affairs? (my stuff) Correct