Hi there iamghee,
UKBA will expect evidence that you can maintain yourselves without needing public funds - see the maintenance (funds) page
The Evidence of maintenance page describes the documents that you should submit to prove that you meet this requirement.
Please take a look at the Evidence of maintenance (funds) page which clearly indicates the type of documents needed.
Bank statements will normally show your income and your outgoing expenditure.
ECO's are not accountants but, if you are generally living within your means and can afford the cost of another adult consumer joining the household, this should be obvious.
There are large numbers of sponsors who are self-employed, so don't woryy about that.
Your husband just needs to supply certified copies of the latest 2 years' tax returns and a notarized version of his business accounts.
Just straight forward documentation really.
My own view is that your application should ideally be submitted before April 2012
