Can I work in a casino, as a security guard I need good expirience to be a police officer and this is a good opportunity for that is it permissible

It is not allowed. The Permanent Committee said guarding places of amusement such as casinos is not permitted because it is helping in sin, and Allah Jalla wa ʿAlā says, the meaning of which is: do not help one another in sin and transgression. Look for the experience in lawful work.