IMAP accounts will always show you the folders that the server provides. You cannot get rid of Drafts of Junk E-mail or other default folders.
In your example, you should map Deleted Items and Trash to each other and Sent Items and Sent to each other so that the client (WLM) and the server agree on the folder. Do this by right-clicking your mail account, choosing Properties, selecting the IMAP
tab, and adjusting the "Special folders" section.
You can adjust the junk filtering by clicking the menu button to the left of the Help button, choosing "Safety Options", selecting the Options tab, and selecting "No automatic filtering". You may also need to connect to your mailbox on the server and seeing
if there are any junk filtering options there as well. Most mail services supply junk filtering independent of the mail client you use. The Junk E-mail folder (either with that name or the name supplied by the server) will still exist. however.
As to all mail going to Inbox, that should be happening already, with the exception of the junk, and you'll be adjusting that as above.
Any other folders you don't want to see can be handled by logging into the server and deleting them from your mailbox.