DON'T DO IT.
Unless you can get into a company like Gavin DeBecker, stay AWAY from security.
You will never make more than 12 per hr, unless you are somehow special and then you might get to 15.
Promotions to Sergent or a supervisor roll....never.
As far as what you need to be a guard....
minimum age 18 YOU DO NOT need a GED of diploma to work as a guard.
Minimum schooling is one week (40 hrs) at an approved and licensed guard class
Must pass a live scan background check....NO FELONIES OR CLASS A MISDEMEANORS!!!!
(FTA/FTP are grounds for disqualification, so are unpaid traffic tickets)
If you are illegal it will show up and you will be disqualified.
You DO NOT need to be a citizen of the country, only properly documented to work in that country. Which will mean you need to seek the proper certification per state/country.
You can be disabled/old/fat/mentally challenged as long as you can perform the basic duties of the job.
From what I see here in California, you should be fat,lazy,questionable in conviction and morals, female and love to play political BS games.