Hello An Jiyoung,
I think you can put it however you want to. But I would also think you'd like to use less space, rather than more, so your first choice seems better.
You could also say something like This site is managed by the marketing department. Contact Joe Smith at ext. 1234 with inquiries. I am thinking you mean this is an internal site, only for people within the company? If it faces the customer, then this would not apply.
The World Wide Web is still a proper noun, and Web should be capitalized... but this is a quickly changing field and some people are already making "web" lower case. Just make sure you are completely consistent in your use, whichever one you use.