If you want to convert a raster (bitmap) to a vector in Inkscape, you'll need to trace the image. Fortunately, Inkscape comes with an automatic tracing tool that requires neither a steady hand nor a giant hunk of time.
Understanding Logo File Formats -- Great info explained in an easy to understand logical way! Know which file is used for what and what you should use & get from your Designer! :) Great for referencing and learning. I need PSF/AI, & high res.