Firstly, welcome aboard. This is a cool place and I hope you enjoy yourself here. Secondly, there's a wealth of information here at your fingertips, you just need to search for it. If I may direct your attention here, it will give you all the in's and out's of posting pictures, whether here or as a sig. Make sure you read the rules on sig size, and check out some of the sweet tutorials in the Graphics & Arts section.