Bankers Casino Blackjack

BankersBankers
I just got back from my second time playing 21 at a land casino. I can't believe I actually left with double what I started with (started with $250, left with $540).
Anyways, I wanted to play banker as the tile was offered around the table but didn't take it because I didn't know how it worked and didn't want to look like a noob. Plus I just wanted to play it safe with what I knew and studied as a player and not banker. (i learned my lesson the first time I played at a land casino without knowing what I was doing i.e.basic strategy and ended up going negative $1000!)
can someone explain to me what I need to do if I were to say 'yes, I'll be banker for the next two rounds'? How much of my money do I need to put up front to cover the table? What if I don't have enough, can I still be banker? what does 'open lock' mean? and what are those little numbered coin looking like things the other side (banker?) who i think uses to cover the cost for the banker/players shortcomings? aaaah! I'm lost. I'm surprised I even left with what I did just on basic strategy.
Basically, what do I have to do at the table as a banker from the time I accept the role of banker to the end of my two rounds as banker.
Alls I know is that if the dealer beats the people at the table the banker/player gets to take whatever was wagered by those who lost. NICE!
fyi. it was at the Hawaiian Gardens Casino.
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Bankers Casino Blackjack Poker

Mobile Blackjack Casino. Mobile Blackjack can offer more benefits for players than its concrete counterparts in Canada. The variety of mobile casinos offering Blackjack games affords players more accessibility and choice based on their gaming preferences. In addition to the cultural reasons Zender outlined, the game has one of the lowest hold percentages in the casino, with an average house advantage of about 1.2 percent on banker and player bets. Also, the player banker is not responsible for the 'bonus' bet payouts for premium hands (suited blackjack, three sevens, etc.). This wackiness all stems from California requiring all table games to be parimutual. It is illegal to play against the house. Except for tribal casinos right?