Questions

I laid a turf lawn last year. Early June this year I used feed on the lawn. Three weeks later I used feed and weed liquid on the lawn. Now I find a lot of tiny dark brown mushrooms on the lawn. I would be grateful if you would let me know how to eliminate these mushrooms

It will be three weeks next Thursday since I had a turf lawn laid in my back garden. I have been watering it twice a day, however parts of it have grown better than others. Is this normal. I would also know as to when I would give it the first cut and how high should I raise the lawnmower. It's a petrol lawnmower. I have been told that feeding and weeding should be done at the end of the summer season, please let me know if this is true.