I can't argue with any of the advice given, in depends on budget. Until you make Masters Tees you can use the starters set, but it obviously is harder with the attributes of the clubs, The R11 set is great but you will find yourself wanting to upgrade again when the g20s become available.
As a bare minimum, 3 good wedges will help hugely and and even with the SD ball, you will get the ball closer - no need for the hybrid as above. I used the starters until I made masters, then my first set was based on meter speed (Raptures)- and found myself upgrading as soon as the G20s were available (with hindsight the Raptures were a total waste for the time I used them). Meter speed was in my mind an issue but in reality was just a mental block. Yes faster meter speeds do take getting used to. Bear in mind the wedges are faster and I assure you that you quickly adapt.
A better driver will help, but always bear in mind this will only be a short term buy. It doesn't take long to level up at your stage, so use the time to get to know your game better, using ALL shots and knowing how to use them. For example, I didn't use a punch shot (unless in deep rough) until I made Masters - I was simply oblivious to the great results it can produce.
Most of all enjoy the game and the journey