Starting a patch from scratch

The area is 30ft x14ft - grassed. There are trees nearby so it does have roots underground - but no other options. 

How would you tackle this. 
I would like to go no dig? I ave weed membrane - and more wood chips than you can imagine. A small amount of compost, manure and lots of card

Can I just cover with card and go for it ....

 I'd divide it in two - two 14' square beds with a 2' foot-ish path across the middle. Then grow your flowers in 14' long rows, in whichever direction works best for light and access.