The basic rules of the language are very hard to learn for foreigners, and 99% of the language consists of exceptions to those rules.
The biggest problem you will face when moving here is that the moment people notice you're an American, they will switch to English. Almost everyone here speaks English, and most at quite a decent level too.
Look for Dutch classes anywhere in the region there, and try to learn a bit before moving here. Once you move here take up lessons at the ROC (institute which helps foreigners learn the language etc) I have colleagues from several countries here (Canada, England, Hungary, Italy) and the rest of the people always speaks English to them. We also use English when communicating with our German office, as most people here are far more fluent in English than in German (Biggest mistake you can make here as foreigner: Confuse Dutch with German... Dutch tend to hate Germans even more than the English do).
Even an English or American accent in your Dutch may cause people to switch, even when you speak it fluently
Edit:
First link on Google:
Edit 2: Typo fixed (Don't type that well I guess

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