Convert JPGs to PNG ( trace around icons / make transparent

Hello Freelancers, I hope you are well I will supply 30 Jpg impages - Need to convert to PNG , resize and trace around making a transparent background Image alter / project Requirements : * the jpg images turned into PNG files * the main icon on the image to be traced around and the back layer given a transparent background. * size of the pngs to be set at 340x270 * Images are to be used on websites like [login to view URL] ( example is the forklift on home page ) * Example of how I would like to see the PNG's is also attached * Most of the Jpgs have white backgrounds 25 of 30 so easy trace around with cs4 / photoshop etc