As said already, you don't need to spend any money if you grind the 150 credits per day. I think I spent the minimum to get rid of the adverts when I started, but nothing more. If you rent each club when you reach that level, you can then buy it at a 10% discount, which is a handy way to save a few credits along the way.
Purely a personal take, but I'd recommend:
Wedges: the L27/L29/L31 Titleist Vokeys are brilliant. Ditch the hybrid and carry all three (You're too late to pick up the rental discount for these, but no matter. And occasionally WGT does a flash sale so if you ever see one, check for a discount on them!)
3 Wood: L51 Callaway MAVRIK - although if you're trying to be frugal, there's no real need to upgrade the 3 Wood until, say, the L86 or L89 Callaways become available
Driver: L55 TaylorMade
Irons: L59 Ping i500
Putter: L70 Titleist Scotty Cameron
That'll get you a long way - possibly to Legend. Good luck!