1. The binding of credit cards mainly depends on what server you choose. If you choose Hong Kong service, most VISA and MasterCard in China can be used together. Japanese clothes and American clothes are relatively troublesome, so it is best to use a local credit card. In China, it seems that only a few banks can support it. You can try ICBC and China Merchants Bank.

2. Just bind your most commonly used e-mail, which will help you to report the loss and get your account back in the future.

Supplementary answer: Japanese clothes ... are too much trouble. First of all, you need to get a JCB card of Bank of China (China Merchants Bank is also acceptable), which supports dual currency of RMB and Japanese yen, and bind it with this card. Secondly, Japan has implemented the practice of locking IP in China, so it is necessary to use Japanese IP. Then there are all kinds of troubles of recharging payment. Anyway, it's very troublesome. It is better to buy physical games directly or bind Hong Kong clothes. However, the game update of Hong Kong Service is relatively slow, and there are not many demo versions. Generally speaking, it depends on your choice. Anyway, it's my first time to tie a Japanese suit for a trial play, and then I'll decide whether to start a physical game or not.