Seasons Greetings Nigel; that is one massive question you are posing there. Bear in mind that most of us on here are “no dig” so ploughing and/or rotavating is anathema to us and I would not recommend it. Regarding paths; I wouldn`t grow anything because it creates too much work. Woven fabric ground cover is a good idea, as long as its permeable and pegged down securely. Keep weeds in check by shimming or hand weeding regularly. I find a double sided, push/pull type hoe is the easiest to use and most effective.
Cheers
Pete