[Tom Bunch]

It looks like you're mostly having trouble getting a document reference - the innermost code you have looks fine (though eventually I'm sure you'll want to see if your resource (me!) already exists in your document).

You say the document already exists? Let's say for the moment that you know it's already populated with resources. Try something like this:

tell application "OmniPlan"
	
	open "::Users:tom:foo.omniplan"
	set myDoc to document "foo"
	tell myDoc
		set Myself to first resource whose name is "Tom"
		set MyTask to make new task with properties {name:"Cure Cancer", duration:8.0}
		assign MyTask to Myself
	end tell
	
end tell

Honestly, I'm not sure how to write something like

if Myself is null then
    set Myself to make new resource with properties {kind:person, efficiency:2, name:"Tom", cost per hour:200.0}
end if

So I'm secretly hoping you won't ask. The above definitely won't work.

-Tom