Regarding resizing pictures:
If you right-click on the image while it's still stored on your computer you should see an option called Resize. Select Resize and click Medium. This automatically resizes the image into a smaller new file. It can then be uploaded to your photo host in a format that will remain consistent without having to manually select the resolution or image size.
It's the size I use and displays like this. Image is 640x480 resolution and aprx, 77kb.
This one is also 640x480 (you get this size every time you resize to Medium) and about 60kb. That's me on the left.
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