Hi,
I think first you need to follow the CX installation guide which would help you configure the CX for installation and ASA basic redirection configuration.
http://www.cisco.com/c/en/us/td/docs/security/asacx/9-1/installation/guide/b_Installation_Guide_for_PRSM_9_1/b_Installation_Guide_for_PRSM_9_1_chapter_01.html
Then you should check the Configuration guide for PRSM and configure the CX policies as per your requirement:-
http://www.cisco.com/c/en/us/td/docs/security/asacx/9-2/user/guide/b_User_Guide_for_ASA_CX_and_PRSM_9_2/prsm-ug-intro.html
Thanks and Regards,
Vibhor Amrodia