Don't buy the putter (my opinion).
Get two wedges, Ping or better, get a 3WD perhaps.
More general, unless the need for a change is irresistible,
- do not start to buy wedges before level 18,
- do not start to buy a putter before level 30,
- do not start to buy woods and irons before level 47/48,
- start buying balls as a Tour Pro, work your way through the list from cheap to expensive. Try to avoid using a ball with higher level than your main clubs.