Buy the Starter Plus iron set for now (same as the starters but with a much smoother meter for only 49 credits).
Also a lvl 14 60º z satin wedge (i'm level 64 and still use this club). Replace your sand (70yrd) wedge with this. Take your best shots off the tee and fairways but focus mainly on your short game; learning chips, pitches, flops and of course, putts.
Also remember that punch shots can be very useful with wedges. Learn how to punch with the z satin wedge. It will get you out of a lot of trouble.