Hi Firenzo,
I can't say really say about joining a CC, as I'm still trying to work that one out for myself :)
I think you've made an excellent choice with the inexpensive but very effective Pro driver - plenty of length and at this stage you will definitely progress through levels and probably tiers very quickly. Will also be good to get used to faster meter speeds - they're really not that scary once you get used to them.
Once you get used to it, forgiveness becomes much less relevant and if you're playing for the long term then all the higher level clubs are more precise and less forgiving, with higher meter speeds, so getting used to that will only help you in the long run.
Important to play within your budget, so I'd also suggest aiming for the pro irons which I've found to be very good for the price. I'd also highly recommend a couple of the Ping Tour-W wedges at 200 credits each once you hit Level 41, just around the corner for you.
With limited budget, I wouldn't even bother buying balls until either you stop improving and progressing through the tiers or get new clubs that really will benefit from extra spin, distance and feel. Also by getting used to higher meter speed of the free "rocks", you leave yourself some extra room for improvement later as the game gets harder, when the extra feel of the balls will be handy with the high level clubs with faster meters.
Much better to buy some cheap and effective wedges as the short game helps so much and it's very possible to progress through the tiers using the free balls. Not as easy but if you enjoy the game and have the time then you get to spend time practicing your skills and increasing your level so the purchases you do make are not obsolete so quickly.
Save as many credits as you can for as long as you can. Treat every purchase as disposable until level 59 - maybe aim for the very nice G20 full set which should take you a very long way.
Having said that, one club I am very glad I splurged on early is the TaylorMade R11 3 Wood (L30+) for 395 credits. Effective from both tee and airway it has good length, excellent forgiveness and could well still be in your bag until for many level and tiers to come.
Hope this helps and happy golfing!
Cheers, Chris