where to find 10x 12 4 sided detached gazebo roof rain gutter sysytem

I live in Hooksett NH.I have erected a 10 x 12 aluminum gazebo in a wooded area approx. 1/4 mile from the main house. The roof is considered a 4 season system and has shown to be strong enough to withstand this years major snow fall and low temperatures. However ,last summers rainfall quickly became a serious issue. The rain falling from the roof eroded the dirt to the point of compromising the entire gazebo site. This area will not grow grass. I have been looking for a way to install a rain gutter system but have not had much luck in figuring out how to proceed. I would love to receive any advice you would offer as this gazebo has become a favorite spot for the family.
Sincerely,

Louise Chalmers

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Sincerely