First things first Sally , will you be prepared to put poison on the plot ?
Personally i don't use any . May as well buy veg from the shop if you are prepared to eat poisoned food , saves all that hard work .
Doing it without poison is no harder , i know , i have never used the stuff .
Your plot isn't that bad mate . Just a lot of green stuff !
You have to work out the area to be dug , then start digging .
The best thing would be to do a sq yd at a time .
I use a garden fork , but you may prefer a spade.
It will be easier to clear the area of as much top growth and root as possible first .
This will entail digging one fork/spade deep and shaking as much soil from the root systems of weeds and grass ,and removing as many loose broken roots as you can . Far easier to do this 1 sq yd at a time .
I find it easier to do this initial clearing with the weeds left intact , the are easier to grab and shake the soil off . Some people strim off the top growth first .
Clear all top growth at this stage and roots as any root left will regrow .
Once you have the whole area cleared and dug , the next step will be the real preparation of the plot ie digging and manuring .
My plot is 60'x30' divided into 4 15'x30' sections for crop rotation . I do one section at a time .
Only rotavate ( if you must ) once you are 100% certain ALL roots are clear . Otherwise you will just be propagating weeds .
Once any area is clear of top growth , weed seeds will germinate . Clear these seedlings once a week , before they can get going , 1 sq yd takes a minute to clear . The more that germinate and get cleared as you go , the less there will be to grow next year in you veg !
Any weed with seed on , burn ! Any dock , couch root etc also burn . But other green top growth can go in a heap to rot down , preferably mixed with some manure .
Take care digging at first .
Only do small fork/spades full .
More to follow as and when youre ready mate .
Again take care !