As a first step to understanding the visa application requirements you should review this thread
All New Guide - How to apply for a Spouse/Partner Visa
You should find the answers and links to most of your concerns.
If your husband can reach the £18600 pa income threshold and has adequate accomodation then averything else should hopefully fall into place OK
P60's are always a question. Technically the P60 issued in April/May of 2012 is already out of date as it is a statement of earnings during the period April 2011 - April 2012
The financial requirements stipulate 6 months payslips and corresponding 6 months bank statements immediately prior to submission of the visa application.
If you review the thread linked above you will see that in principle savings are not counted unless under special circumstances, and then only thos amounts above £16000
The UKBA fees can be found here
The Visa for Spouse is currently £826 (this is P57820 based on current British Embassy exchange of £1 = P70)