Agreeing to the rules of a contract

I signed a contract for work. I didn't want to, but I didn't want to have any problems because I want to work this halaal job. At the bottom, it states, "I acknowledge receipt of this summary and the attached contract of employment. I accept the terms of my contract of employment. I have also received and read a copy of the Employee Handbook and I accept the rules, policies and procedures set in it." I signed it and the Employee Handbook is exhaustive to read (I did read it) and I am having problems with my conscience because I take my word seriously and I want to know that if I failed in some of the rules is this taken as me "lying" or what does it mean? Or does it just mean that I am liable for my failures?