When should we apply for quashing of fir. its good to apply after charge sheet or before it

I have been charged ipc 376 and 323 . in a fir Victim has shown her one marriage, she has hidden her first marriage divorce . acctually she has got divorce from the first marriage and have applied for divorce for second marriage and in this time she was in a relation with me. in fir she has stated that i have hidden my marritial sttaus with her. but its not true. she was well aware about mY marriage and my children from the first day. in a fir she has put one more allegations against me that i promised her for marriage then we had a physical relation with each other. but reallity is that she was very well aware that i was a married man, and she was agreed to have a relationship without disturbing my marriage life. she herself offered me to have a physical relation with her because she loved me very much. but after getting too much closer to each other she started blackmailing me to marry her or otherwise she will inform my wife as well as to police . because of it i promised her for marriage, but due to difference in religion i was not able to Marry her. when i refused her for marriage she has filed a case against me . and i have been charged ipc 376 and 323. i have got antiseptory bail. i am now confussed should i apply for quashing of fir, or should i apply for quashing of fir after charge sheet has been filled. also please guide me what are the chances for me to get aquitted from the charges. what proof should i collect to proof myself not guilty. as well as that women has a past history of filling a case then doing compromise on the cost of huge money. and can i collect the evidence if she was also in a relation with other man at the same time when she was in a relation with me. please guide me what evidence can save me and it will help me for quashing of FIR.