"One is if you lose your key you won't be able to access your coins, right?"
Right but that is life. Make back ups when you have something critical like that.
"two, how is tax going work?"
The same way it works with anything else. The government will come in, assert that you own X in taxes on your Bitcoin income, and you will pay it or go to jail. You will probably need to pay with something other than Bitcoin, of course, which adds in transaction fees (but you just pass that cost on to your customers, right?).
"Third, bitcoin price goes up and down so rapidly"
By extension, your prices change daily. You'll probably charge a fixed fee in your local currency (Yuan?) and adjust your Bitcoin prices according to the market value.
Comments
"One is if you lose your key you won't be able to access your coins, right?"
Right but that is life. Make back ups when you have something critical like that.
"two, how is tax going work?"
The same way it works with anything else. The government will come in, assert that you own X in taxes on your Bitcoin income, and you will pay it or go to jail. You will probably need to pay with something other than Bitcoin, of course, which adds in transaction fees (but you just pass that cost on to your customers, right?).
"Third, bitcoin price goes up and down so rapidly"
By extension, your prices change daily. You'll probably charge a fixed fee in your local currency (Yuan?) and adjust your Bitcoin prices according to the market value.