If a detective wants to speak to me then do i have to go in? or is it best to get a lawer first

Good Morning,  You are under no obligation to speak to a detective.  It is your Fifth Amendment right to remain silent when law enforcement asks you questions meant to elicit responses that can subject you to criminal charges.  If you want to speak to them, it is best to have a lawyer present to advise you as you are being questioned.  Please remember, even if you answer some questions, you can invoke your right not to answer at any time.  Also, if you are exercising the right to remain silent or have a lawyer present, you need to clearly state that.  Asking or contemplating if you should remain silent or have an attorney does not invoke those rights.