Nothing happens until someone puts an order that's equivalent to your selling price or higher.
No. The order would be filled immediately with bitcoin market price because the price set is too low than the price of bitcoin. Orders won't be filled at $2000, not possible. It would be filled immediately at the market price because of the lower price set. Check my explanation above.
My answer is based on the hypothetical situation which is the zero-buy order mentioned in the OP. It won't happen because it's bitcoin and volume or the buy orders for this coin in all real exchanges is already high. Check my succeeding statement where I also said it could happen to other tokens.