Submission of Documents for Visa

Dear Sir,

My wife and I live in Johor Bahru. We are student and we have student visa. I emailed you to ask some questions:

1- Our flight is in 14 June 2013, when we can apply for visa?

2- Since we live in JB is it possible one of my friends submit our documents?

3- Is it possible one of us come for interview?

Best Regards.