What do you need in order to get married in a holy matrimony here? Also is it any problem if I am Christian and only him Muslim?

I won't agree with what William Q Caraway said. You have the right to choose! Either to keep your religion or revert to Islam! There is no force. And of course it is up to you both what to do!

I believe u would have 2 be Willing to Convert and the Both of You need 3 witnesses each As Well.