Hi Bobbyray! Welcome to the forums, I hope you enjoy your stay! It sounds like you're doing some interesting work there.
Regarding posting images to the Gallery forum, you can find a step by step guide here: http://www2.ambientdesign.com/forums/showthread.php?t=5
If you want to link to images in your user gallery within a post, you can click the 'Insert image' button when making a post, then enter the URL. You can get the URL by opening your image in your Gallery, then copying the text in the 'Direct Link Code' box. That will put the image in your post at the same size.
I'm not 100% sure what you're seeing there regarding the three types of image links, but I should be able to help with that once I know a little more.