Ollie- Put your front foot either in the middle of the board or right behind the screws and your back foot on the top of the tail. Push down on your tail, hard. Slide your front foot up the board to the nose and do kind of a jump. Now you can ollie. Try doing steps now
180's are the same as ollies except you turn while in mid air, simple.
b/s cabs come easier for me then f/s cabs i dont know why. The trick is a fakie b/s 360. Get in fakie position, ollie and turn really fast backwards and land. I can't really explain it.