New pond and absolutely no idea what to do...

I salvaged an existing pond that had been totally neglected. I don't know how long it had been without power to it.

http://i862.photobucket.com/albums/a...1301315647.jpg

Upon emptying it, I found one small fish, not exactly sure what it is. I dropped it in my girls goldfish tank. Hopefully we can figure out what type of fish it is, decide if we want to keep it, and keep it alive till we figure it all out.

http://i862.photobucket.com/albums/a...1301359402.jpg

It is kind of a oval shape, maybe 6 ft by 4 ft by 2.5 ft deep maybe. My guess, it's around 450 gallons.

http://i862.photobucket.com/albums/a...1301357902.jpg

One pump had a sticker that read submersible, 1500+ gallons per hour. The other pump looked like it ran a small fountain in the middle. I did not see any filtration at all.

http://i862.photobucket.com/albums/a...1301357334.jpg

There is one drain on the side near the bottom. I broke the bulkhead fitting removing the unit. The lines were all tangled in roots.

http://i862.photobucket.com/albums/a...1301357958.jpg

http://i862.photobucket.com/albums/a...1301357406.jpg

http://i862.photobucket.com/albums/a...1301357496.jpg

I would like to have some fish, and flowering plants, but again, have no idea where to even begin. I was hoping someone could help me get started in the right direction.

I'm familiar a bit with fresh and salt water aquariums, but somehow this seems like a completely different breed...

Thanks for any help.

RocketSurgeon