Well man, the best advice that I can give you is to wait til you are promoted from Amateur to Pro. Becoming Pro will give you the best upgrades to get to Master and isn't to hard to achieve with your current setup.
When you become pro [which won't take too long], my first recommendation is to buy the 2010 Rapture V2 Pro 9.5° Driver for 1,185 credits.
Rapture's Stats
Average Distance: 255 Yards
Trajectory: Med/High
Precision: 2.5/5
Forgiveness: 4/5
Shot Shaping: .5/5
Spin: .5/5
Meter Speed: 1/5
Purchasing this will greatly increase how you hit the ball off of the tee, thus affecting how easy your approach shot will be. Obviously, the less distance you have to the hole, the easier the shot will be [most of the time].
After this you'll still have 615 credits left.
After this I recommend upgrading your Putter to the Redwood ZB Putter. This putter is abysmally better than your Starter Putter.
Redwood ZB Stats
Precision: 4/5
Forgiveness: 2/5
Balance: 3/5
Meter Speed: 1.5/5
With these two upgrades, you should be set for a good ride! However, there's lots of experimenting you may want to do in the Pro Shop to see what best fits YOUR BUDGET, but that is definitely what I recommend! Good luck and happy hitting!