The public Flower Market is :
In an area of Amsterdam called Singel
it is open: Monday to Saturday 9.00 a.m. - 5.00 p.m
The professional market is out near the airport, but as I said, you wont get in.
For Indonesian food there are loads of restaurants, any will be good, but here is the website of one:
The riistafel is just a generic name for "I don't know what I want just bring me loads and loads of diferent things and I'll try them out". You cant miss!!
The Mongolian Restaurant that I used to go to regularly is in the Marnixstraat (if it is still open). You can find it on this map:
...........just next to the info office.
Incidentally this map page also shows you the location of the Rijksmuseum, the Van Gogh Museum and others.
Have a good one.