If you want to become an Excel expert, but you do not know how to use Excel more than the beginner level you need to determine what your current skill set is, and based on that you need to determine where to start. You can also hire professional excel spreadsheet experts to get the best business solutions online.
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Once that has been achieved you need to get some things in order before you can start to learn Microsoft Excel at an intermediate level.
You need to buy a copy of Microsoft Excel 2010 (Windows) or 2011 (Mac). Both Excel 2007 and 2010 will be good work, but 2010 has few new features that are very powerful and should be used. Thus, stick with the latest version. 2011 will work on a Mac 2008 for Mac does not have VBA, and so you will need to work in Office 2011.
The next step is to buy one or more books on how to use Excel. You will want to switch to an intermediate level book from beginner level after you have made some progress. Many books cover both.
You also will want to join social sites like LinkedIn. They have Excel and Excel VBA user groups are free so you can post questions. You can also go to Mr Excel, expert-Exchange, or VBA Express to use their forum. Experts-Exchange does not charge a fee and it is the best of the three groups.
The next step is for you to take a beginner level Excel book and to take a seat in front of your computer with Microsoft Excel running.