You're doing just fine as far as forum etiquette. We don't stand on much around here. You can have a look at the FAQ for various questions, but as for the image posting stuff, here's some steps:

1. Upload your image to a website or image hosting service. I don't recall at the moment which one people recommend around here, so I'm really useful.
2. Link that image by doing this: [ image ]http://path.to.image/image.jpg[ /image ]
(remove the spaces)

I am the Doctor, and THIS... is my SPOON!