Help - Creating Liquidity Pool for my new token for the first time

Hi everyone. Im launching a project for the first time and ready to create the liquidity pool for the first time on Pancakeswap.

Token Supply: 500bn

BNB I want to add: 1BNB

My question is how much of my new token should I set for the 1BNB so as not to mess things up and also make it tradable.

The smart contract is already coded to automatically add 3% tax which goes to the liquidity pool when trading starts. I turned that off already and its at zero at the moment,

I appreciate your help.