Go to the Map Making Discussion & Philosophy forum, into the World/Regional Map Forum, start a thread with your points and questions.
Now click on the "paperclip" symbol on the message editor. When the Manage Attachments popup opens, click the "Browse..." button in the upper entry box.
Search through your PC using the browser seach tool to whereever the file is, select it, then click "upload" wait to the file appears at the bottom of the window. Then close the attachment.
Hit "Submit Reply" and your map is uploaded into this site to face critiques and help - OK?