First, the clerk's job is mainly to collect and sort out information. It also depends on what kind of clerk you are. The job content of each kind of clerk is different, including financial clerk, statistical clerk, personnel attendance clerk and so on. But I just looked at the company you want to go to online. It's not very big, so your work will be more complicated.
Second, working hours are generally eight hours during the day, from 8 am to 5: 30 pm. Of course, you may have to work a little overtime when you get there, because you have something to learn.
Second, it depends on your work. If you have a business type, you should work overtime. If you only deal with information, there will be less overtime.
Third, if you go directly to the company for an interview, sign a contract with the company. If you are a labor dispatch, your contract is signed with the labor service company, but it depends on the specific situation. It is generally better to sign a contract with a company.
It seems that this is your first job. I wish you success! Thank you!