New Pond

Hi Guys.
Currently digging out a 6x8m patch of ground elder to put a pond and bog
garden in - patch sits in front of a sycamore stump (area that once was
shaded before tree was cut down [before my time] has no grass - only
ground elder) having a wonderful time pulling roots out of the ground
and rescuing hundreds of bulbs (snowdrop? bluebell? chive?)
Pond is envisaged to be around 4m at longest point and 3m at widest
point.
Pond is not for fish, unless some find there way there unassisted. Pond
will be for whatever decides to make its home there.
Any advice (as in ANY advice) will be greatly appreciated.
My only rule will be that I do not want any foreign species in it (other
parts of the garden yes - but this area is native species only :-))
John




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John Sankus