dear want to shoot in the 70's
first thing first you need to be able to set up to the ball and have a proper grip, if you feel you have this then you need to
practice almost everyday to grove your swing because shooting in the 70 takes a repetive swing and I feel you can only accomplish this by hitting thousands of balls, first you need to start with your wedge and learn to hit it a certain distance granted the more you practice this distance may increase but you cant play golf without knowing how far you are hitting your irons, the way I learned to breaking seventy I had a shag bag and starting hitting my wedge and tried to hit them in a twenty or thirty foot circle, if you learn how to hit 50 or 60 balls at a givin time into that circle you will be breaking 80 and 70 before you know it.