Having worked in Law Enforcement and Security as other people have said this is a
pretty broad field. In the security field itself while going through school and after wards I have worked many angles of it from Security Alarm Monitoring, Loss Prevention, Private Investigation which also led to some Executive Protection work as well as being a Security Director at a major facility for quite a while. (this seems like it was all in another lifetime as it was quite a while ago
)
Now it looks like you are interested in
Executive Protection and personally I found this a very, very hard field to break into. (though not impossible and I managed to work several details) When performing my duties as s Security Director I used to employ a lot of EPA (executive protection agents) part time while they were in between jobs. Some times this lasted for six months up to even a
couple of years. In this field first and fore most you need skills relevant to it and you need to acquire them through training. There are many schools out there here is a couple I have goggled:
http://www.esi-lifeforce.com/
http://www.personalprotection.com/
http://www.frontsight.com/ExeProtection/executive-security-training.asp
http://www.executiveprotectiontraining.us/
I have experience personally with people who were trained by ESI and they all ended up being good employees.
There are more of course and if you have prior Military experience or Law Enforcement experience
this would help quite a bit. As would having a Bachelors or Masters degree. All of the above are not needed but it helps in a truly, truly competitive field.
Understand one thing though in that this line of work is not
glamorous!!!
(very boring as a matter of fact that is unless some thing were to happen)