You don't have to hurry. It's better to take your time and find a good young trainee with high potential, rather than getting a random useless one.
I hope your doctors and PR manager have low salary too? I'd advice to you get a competent doctor, and the same for the PR manager (or even a basic PR manager would do) (I have a competent doctor, a superior trainer and a basic PR manager).
Make sure you invest in your arena. It's the main source of income and it's VERY crucial to keep on expanding it.
Only the champion of the Indian Tournament and the champion of the Top league in India, IPBL, can participate in B3.