Welcome aboard! There is a wealth of information available here you can familiarise yourself with the techniques used.
The idea of constantly tinkering with our trees is a bit of a misconception in reality its probably best to just leave them to grow to thicken the trunk for now, first chop should be when the trunk is almost as thick as you plan for it to be at its widest point, then slightly less thick for the next chop and so on as chopping will greatly reduce the amount of growth in the trunk.