Posted: Today at 19:05
I would start with a small area first, nearest the house so you can see any improvement from the house. Dig it over carefully removing anything that you know is a weed and tidying round anything you are not sure about. If you post pics of things you are not sure weather to keep or not someone on here will know what it is and advise you.
Do NOT try to do it all in one go as you will kill any enthusiasm you have and injure yourself at the same time.
DO take photos as you go along. It will help you keep motivated, as you can look back and see what you have done....not what still needs doing
And above all enjoy yourself.