#1
No not like you think. I'm having some trouble with the hammer-on/pull off combination.

Example:

5h7p5

Please help me.
#2
Hamer-on is all about finger strenght really. Make sure you hit the string hard. When pulling off don't pull your finger straight up but move it down a bit, that way you'll kind of pluck the string which gives a louder sound.
#3
Well, put your first finger on the fifth fret, and hammer on with your ring. As soon as you do that, pull off onto your index. You may need to bend it slightly to get the last note to ring out.