How to engeged with big 4 firms?

PLs can anyone say me what is the procedure of selection in big 4 firms? myself lokesh jain i hv completed my ca final in 2 attempts in non 11 attempt... now i want to join big 4 firms for tht i hv lots of questions whose answers i nedd??

1.  how & where to apply

2. after apply wht is the procedure they will call us for interview or something wlse

3 . wht is selection procedure

4 hw much salary can we expect

anyother thiung whch u want to share with me..pls help me.. thnaks in advance...