I want to upload photos to my 'underconstruction website' but first I need to resize them. I have only a limited knowledge in this area. I have read and understood that the major issue in uploading the proper size is pixel width and height. Now someone has told me that the 'file size' also needs to be considered and compressed. I have a trial version of Paint Shop Pro.

In Paint Shop Pro, how do I properly resize the photos to upload, some need to be thumbnail size and others larger? And how do I be sure the file size is correct?

Thanks for your help