I am still involved in doing that myself, off and on, for some time now. I use an Epson Perfection 4490 flat bed scanner that can do all you need: negatives, slides, 35mm and medium format, and its software is fine for me since I then do PP on all images as required, in PS.
I know that this software is really good stuff and is well known in this field but I haven't jumped yet:
Manuals & Tutorials for SilverFast 8. I'm not sure if it is compatible with your Lexar?
As for tutorials I have found Lynda.com to be very good with Taz Tally's presentation, mentioned in the document above.
One item I'm picky about is scanning resolution - don't be shy to go as high as you can (depends on file size, of course) and use TIFF format, even if you downsize the chosen images later as JPEGs but keeping TIFFs is better as those images will more than likely be stored as reference documents with best quality.
Hope this helps.