Posted: 24/04/2013 at 22:59
Glyphosate takes about 3 weeks for the weeds to die. The weeds absorb it through the leaves and then it kills the roots. It doesn't rest in the soil so when the weeds are gone you can grow things straight away.
That all looks almost professional and a lot for a beginner. Don't try to do it all at once. Nettles may take more than one go to get rid of. If you want to grow something straight away you could grow some tomatoes in the tunnel and clear a raised bed or two for growing something you like.
I think it would be a good idea to buy a good book on gardening. Amazon would have some at reasonable prices. It's a big subject and confusing at first. Also think wht you would like to grow and "Google" it for advice.