Your 'requirements' aren't terribly good - we have no idea of what your level of understanding and experience is, and what you didnt understand.
Until 5 mins ago I had sfa knowledge of SolrNet - but a quick search found an article I like
Solrnet, a Solr Client Library for .Net - ChrisUmbel.com[
^] ... In that article Chris has a section 'Writing Data' - my thoughts are, for data from SQL, you would/could
- Create a DataTable and Load it with information from SQL server
- Loop through the DataTable, Doing 'Solr.Add()' for each row
Maybe I'd suggest dont even worry about the WPF bit to start with - start writing some test console programs, get to grips with SolrNet, and while you're doing that you can flesh out a design for your WPF program
- what sort of input you need to select your data from the SQL database,
- how you are going to get query parameters from the user ie 'tags' and the like,
- how you are going to display the results back
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