There were numerous questions at the February meeting about getting the export file size right and ensuring that the EXIF data is retained. Here you will see a screenshot that will help you do so using Adobe Photoshop Lightroom.
As you'll see, in this one panel you set the file format, the colour space, the quality level, the resize setting for 1024 pixels on the long side and resolution at 72dpi. You also see the option to include all metadata in order to retain the EXIF. If you have questions, leave a comment.