Any special diet myself or husband she be on while trying to conceive?

A healthy one. A healthy diet is best when ttc. While special diets for fertility have been touted, it's truly best to just eat healthy, exercise regularly, and simply be healthy. If you want further elaboration, it may be in your best interest to sit down with your fertility doctor and review things important to do before conception (like a woman taking sufficient folic acid).
It depends. Depending on your current body weight, changing your diet may either make no difference or make a huge difference in your fertility.