It's all a bit beyond me too so I downloaded
Picasa That allows you to do basic editing, and you can export at a given size to a folder ready for uploading to Photobucket or where ever, I export pictures at 800x600 which gives a nice size for viewing.
Another advantage of Picasa is it allows you to view all your pictures easily and quickly where they may be on your hard drive, and the best bit, what ever you do to the pictures in Picasa, they remain unchanged in their original location so no fear of losing them or messing them up.