Hello,
In order to keep the server utilisation as efficient and reasonable as possible, it would be best to host your pics off-site, and link to them in your posts.
For those that DON'T know (and I'm sure you all do ...), best is to open a free PhotoBucket account (
http://www.photobucket.com) and then post a link in your text to the picture using the 'Img' button at the top of the message header. Photobucket allows you to load full-size images, which then render nicely in your topic. They are also kind enough to provide you with the correct address for each picture to copy and paste into your posting.
There are other sites around that offer similar features and functionality, so feel free to use whatever works best for you.
Have fun! Remember - picture often fill in the blanks!