bowling green construction.

[welshlad]

Hi all. My question is this.I have a small lawn, size ia 23 feet by 9 feet.I want to construct a bowling green on this lawn.Do i need to remove the grass that is there or can i cut it very short,top up with a good loam ,rooler it flat then sow seeds?If i have to remove the lawn that is there when i have rolled it flat do i need to rake it over before i sow the seed, or do i sow the seeds when i have rolled it flat?Also what is the best quality seed to purchase and where from?Any advice would be gratefull,many thanks , welshlad..