Ruchit Micro

Hey guys let's say I have a huge mapping of holders and I want to run a loop to reset all their data than will it cost a huge gas fee?

After creating an erc20 token do we need to send all the minted tokens to the contract address?

I have 2 contract code in 1 file. If I deploy the file on the chain can I access both the contracts? If yes than how?

How much liquidity should you add for a 1billion token ? Is there any math or number on how to do it properly?

How are people gonna buy if the initial msg.sender has all the supply?