You can follow the step by step of storing Bitcoin safely from many tutorials. You don't have to worry because of quantum computers because as long as you can take care of your wallet, there is nothing bad happen. No need to be too afraid of that but you can search and read other info how to protect your Bitcoin in your wallet. You need have much knowledge so you will know how to secure your wallet so that will be safe from bad thing. I am sure experts will share more things about securing a wallet in the middle of quantum computers so there is no way your wallet compromise if you can take care with good.