My opinion only:
Level up to 59.
Buy:
G20 Full Set (L59+) 3,995 Credits
Daytona Putter 2011 (L55+) 725 Credits
TaylorMade ATV 54° Wedge (L38+) 495 Credits
TaylorMade ATV 60° Wedge (L39+) 495 Credits
TaylorMade ATV 64° Wedge (L39+) 495 Credits
3 Pack of Nike 20XI-X Balls (L48+) 400 Credits (as many as you want)
Get these clubs, take the time to learn them (especially punch shots and spin differences on wedges) and you'll improve no end. These will get you to Legend and maybe beyond if your putting is good.
The putter is not what I use but many Tour Legends use it.