ILR and limted company documents.

Hello Guys,

Currently I am on tier-1 general visa and due to ILR next year Dec-2015. I was working as staff until now but thinking to start contracting through limited company. After taking advise from friends, i came to conclusion to establish 50-50% share holding between me and wife in ltd company. My income requirement is 40K/year for ILR which is same as tier-1 extension.I have following questions;

(1) Is there any difference in 'documents requirement for ILR application' for 100% share holding company and '50-50%' share holding company ?
(2) Please advise salary-dividend structure which me and my wife should withdraw if my company is earning 100K per year in order to fulfill my 40K income requirement.
(3) any new rules enforced by UKBA for ltd company directors in recent time ? i.e. Your company must have business at the time of application etc...

Appreciate your advise on top of the above queries which you think more important.

Thank you.
silkroute