Some folks will be suggesting to buy the millionaire card so I would suggest you do that and save up.

I did purchase some packs and yeah it was a good investment to start with the game. But what I am regretful of is not stacking up instruments. I told myself that if I had stacked up some instruments, I will be getting some good Xps per hour around 200+ perhaps. But still it really depends on how you view the game and what you want to achieve in the long run.

All the best! And don't forget to join raffles and giveaways! You might win some cards and starbits for free there.