You could probably just do the publishing order.
I don't think it would mess anything up.
Mike's Amazing Comics would be the best resource for that.
DC Comics on sale May 1991 - the month Impact launched.
Legend of the Shield launched in May.
Comet and the Jaguar launched in June.
The Fly and The Web (intentional pun?) launched in July, as did the Who's Who in the Impact Universe.
Then Black Hood launched in October.