Hi, i am Rahul Gupta first of all its great that you are thinking about your career seriously but you need to calm and flow with the process
First prepare for your ca foundation exams with the help of teachers and mentors who are best according to you or you can watch YouTube videos for guidance then after giving ca foundation you need to prepare for ca intermediate and during this process you will come to know many thing about journey and articleship your mind will change your views will be different from that those are today then you will enter into a world called linkedin
It is not necessary that you need to do articleship in big 4, although it is good to think big and you can make connections during the process that is not the concern .
I will recommend you now just focus on your ca foundation preparation things will automatically sort as you achieve and move forward .
For any kind of help you can talk to your teachers and reach out to me on LinkedIn
Rahul Gupta