You can start reading here I guess...
Site information - Micro Four Thirds User Forum
I started by posting directly to my blog but that space gets eaten up pretty fast and there are file size limitations. If you start uploading to a Gallery, even your own, you will have no limitations on file size, just a ceiling on total usage. Once there, your images can be inserted into your posts at will.
Notwithstanding the above, unless you are trying to make a point about image quality, 1024 longest side works pretty well around here, images 400K and up to a meg.
Bokeh D