I have a forum domain which I'm planning to start a forum/board on it.

The domain is: [LetterLetter]Forum.com (LLFORUM.COM)

A global company is using the L&L as an acronym and have the domain LL.COM as their main site.

Their acronym L&L is not a trademark in the country I live.

My questions are:
1: Would I have problems if I'm using the LLFORUM.COM related to the company or its products?
2: I see lot of forum/board related websites that uses [CompanyName/Trademark]Forum/Talk in their domains, is that legal?
3: Would you advice me to use the domain related to the company and it's products?

Thanks a lot for your input, I appreciate it.