Where is the option to put the coins in the bank to secure them?
You have to first buy the bank and then you will be able to deposit as much as you want but be careful because the fees are very high so it would be better not to do too many small transactions but rather deposit all your coins at once and withdraw a lot at once aswell when you need them, if you have too low money its better to just buy something from the stop instead of depositing to the bank
Yup exactly, You can buy some shop items like carrots , mangoes, monkeys and bunny's they can be traded for bitcoins then. So you can keep your money stored in form of these.