No,3,000s relates to 30 contracts.It's 100s/contract.
Selling the $11 means you are willing to 'give up' or sell them at $11 if you don't close the contract(s) by expiry. Make sure you understand how that works before doing any of this! There are obligations from selling the contracts! I always close the positions.
*IF* you think it's going that low, why not buy a $#!^ ton of $11 puts instead? Just playing devils advocate here.