I think Tom covered most everything. A few other things you mentioned;
Spotted turtles won't generally eat out of water, so the plant you put in the land area will be more for aesthetics. Choose something non-toxic, or even fake. In the water, you can try putting anacharis. If there's a plant that they will eat, it is usually anacharis.
There's a company that makes some pretty neat little tools for cleaning aquariums. I think it's called Python something (really helpful, I know). The siphons come pretty large, and you can run them out a window, hook up to a garden hose, and you're good to go. Also, you can usually find cheap sump pumps on ebay. Just make sure they're new!!!! You never know where they've been.
I know you're set on a waterland tub. Those things are pretty large, and you could house a few females and some large juveniles. If you only have one male, you could house him in a smaller enclosure. Honestly, a 30 gallon tank or equivalent sweater box would suffice. As long as it has adequate lighting, you should be ok.
You may even want to wait on breeding until you can master having one setup.

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