Here's a nice website on the topic, complete with descriptions of spices used, recipes and pictures:
http://www.malaysianfood.net/ I was born in Malaysia, so I'm a little biased...but the food is incredible. :) Seasoning is similar to Thai and Indonesian cuisine, but not exactly alike. (It's a little difficult to explain, the website will probably do a better job.) A few things to look out for:
roti canai, a wonderfully flaky round of bread with curry dipping sauce
beef rendang, slow cooked beef curry with a very thick gravy seasoned with spices and rich coconut milk
ikan pari bakar, usually stingray or fish slathered in spices or sambal, wrapped in banana leaves and grilled
nasi lemak, usually breakfast food, it's coconut rice usually served with curry, maybe a hard boiled egg, some
ikan bilis or dried fish, and sambal chili sauce on the side.
satay, of course, a classic dish done with chicken, beef, mutton or pork marinated in coconut milk and spices, then skewered and grilled, served with cucumbers and onions with a peanut dipping sauce
chow kway teow, a garlicky, spicy dish of stir-fried noodles with bean sprouts, scallions and usually shrimp, but sometimes with cockles or mussels in addition to this.
Oh geez, there's really so many dishes to list... Fish head curry (way better than it sounds), various spicy crab dishes, it's all good. I don't know what your local restaurant might offer, but the above are some of the better known dishes that are likely to be found in a Malaysian restaurant. I'd say just go with your instincts and enjoy. :)