How do you do an ollie?

ok I’ve been trying to master an ollie for a while and im having no progress. everytime I do it I do the same thing because I cant figure out what im doing wrong. well when you go to pop the tail is that the only thing you do (just extend your back leg?) or do you need to jump off of your back leg? so basically I cant get the trick down in one movement thats my problem.. I try it on the carpet most of the time but when I do it on the street or my patio outback I realize how wobbly my trucks feel when im on the board, but their actually really tight when I am holding the board and feeling how tight they are..is this because my bearings make the wheels go really smooth..? so what I want to know is: tips for doing ollies and whether or not I just extend my back leg or I jump, and why my board is so wobbly only when im riding it