Looks good, ponds are expencive at first and a lot more work than an aquarium, but much more rewarding, I love working on our ponds even when it means gettin mucky. I think; im no res expert(got mine yesterday!) but I think if he was a wild one he will be able to keep some of his wildness with the pond. You will grow to love your pond, you can put many plants and things in there to make it look good.
To vaccum our ponds we use a thing called MuckVac, it attaches to your garden hose and creates a low pressure area in the hose so it sucks. It sucks things very well for us, the provided hose isint very long so we went to our local swiming pool store and bought a long rubber hose that we rubber band to the vac, so then we just move the hose around our plants, clean and water at the same time! Be careful not to suck up any fish and things with it, fish love flowing water so they will be attracted to it and also will be looking for food in the stired up debris. Another thing we do to suck is we have a little dry pump that we hook to our garden hose, you may be able to find a cheap pump at a flea market.
In short time your pond will start to grow a lot of algea, algea in small amount is good, it makes things look a tad more natural. If you want to get rid of planktonic algea(the stuff that makes green water) the best thing is to invest in a UV light, they are not cheap but it's really the only way to keep your pond clear enough, otherwise you wont ever see your turt untill he comes up to bask or get air. Also Barley is a great natural clarifier and water conditioner, you can buy bails or extract. Also it may sound gross but the more worms, snails etc you have living in your pond the better, they eat and decompose algea and other things and are another great water filter.
Also I am sure you have a pH reader in your house? Make sure you keep a balanced pH in your pond, without it everything unwanted will come and come quick. It looks like you have a shady area so you should be fine. Lookin good! Keep the news commin!
Also what I saw in our local pond store was a piece of old wood with a board nailed to it at a downward angle. The turtles seemed to love sitting on it.
