Create a new Markdown document in BBEdit and save the new file to a predetermined location, prompting the user to rename it. I keep all of my "notes" in a folder in my Dropbox.

bbedit-new-markdown-note-to-dropbox.scpt

tell application "BBEdit"
	activate
	make new document
	set theDate to short date string of (current date)
	set text of document 1 to theDate as text
	save document 1 to "/Users/YOURUSERNAME/Dropbox/Notes/NewNote.md"
	set old_name to name of text window 1
	set dialog_result to display dialog "" default answer (theDate) & " - " & ¬
		".md" buttons {"Cancel", "Save"} default button 2 ¬
		with icon note ¬
		with title "Create a New Note"
	if button returned of dialog_result = "Save" then
		set new_name to text returned of dialog_result
		set d to active document of text window 1
		if (d's on disk) then
			set the_file to d's file
			tell application "Finder"
				set name of file the_file to new_name
			end tell
		else -- it's a document that has never been saved
			set name of d to new_name
		end if
	end if
	
end tell