There is no easy way to convet a .jpg, .tif., or other bitmap logo into a clean, usable, vector file. You can not simply "save-as" on a bitmap image to convert it to a vecotr file. While you may be able to save as an .eps or.ai format, it will not have the outlines we need to prduce your signage.
See if your marketing department can provide you with this file. If your logo was designed by a professional graphic designer, most likely it was originally created in a vector format. Also try to see if they can provide it to you. Otherwise we can convert your file for you. The fee will range from $50-$250 depending on the complexity of your logo.