急～～面试成功,怎样用英语回答offer letter?

Dear sir/ madam,
I am really glad to receive your job- offering letter. But because I have to handle some personal affairs, I will check in next week. I am regretful about the postponement and hope you can understand it.
Moreover, I would like to know more about my job and I will appreciate it if you can take up a few minutes to answer the following questions:
1.
2. .
Yours sincere
...
（最好还是打电话问省时一些）