Here are some books to start with. Toolkits you choose can be based upon whichever toolkit is in use where you are working. Most Data Warehousing professionals adhere to either Kimball's methods or Inmon's, so having knowledge about both should help you in the future. I included the other, because I respect the work of Imhoff and Geiger. I was lucky when I started, I was asked to take over maintenance of an existing Proof of Concept Data Warehouse. Good luck, and if you need any help, let us know on StackOverflow! The books I provided so far are general design and methodology books which are technology neutral. With good knowledge of these methodologies, and some specific training on tools, you should be able to work with any BI stack. You might want to try several toolkits to find one that fits your style. I have worked with the Microsoft toolkit almost exclusively, but I have touched on Cognos and Hyperion at various times in the past, and the place I am on contract to right now is switching to Informatica for ETL. They all have good and bad points, so it comes down to being adaptable and a quick learner, just like any other IT job. As a web developer, you probably used many tools depending upon what you did, i.e. you learned HTML first and then did some CSS and maybe some javascript, you may have also used tools like coldfusion. But the point is once you knew the basics, like what I presented below, the tools were secondary.
Kimball's Data Warehouse Toolkit
Mastering Data Warehouse Design (Imhoff, Galemmo, Geiger)
Inmon's Building the Data Warehouse