1. Budget?
A: INR 12-20k .
2. Preferred display size, type and resolution?
A: 4.7"-5.5", IPS LCD/AMOLED, FHD and above
3. Preferred operating system? (Android (with version), iOS, Windows Phone etc).
A: Android Oreo should be the least, with a promise of pie and updates for 2 years, shipping...
If you are not going to buy a graphics card in the near future, get ryzen 2200g :- https://mdcomputers.in/amd-apu-quad-core-ryzen-3-2200g.html .
The integrated graphics will let you play less demanding titles such as rocket league on medium settings and still output < 60 fps .