Hi the above link is the best way to start, this is the most helpful section http://www.ignatzmice.com/Clubs,_Prives,_Massage,_FKK
there is in the site somewhere an insane photo map listing every single red light doorway and who works there and what time, its a work of art. But having been to Dam most years, not for girls really but for the rapidly dwindling coffee shop scene, I can assure you the RLD is the worst place to have a genuinely good time as others have said. In short no matter what you ask for in advance and no matter how fit the girl is or sweet in reality have no idea until its too late if you will get half of what you want, at best.
There are exceptions, my mate ended up with his chosen girl summoning the girl from the adjoining booth to join in once, he's a good looking charmer I might add, another time a mate had a second go on the house because they clicked, last trip I had one of the best BJ's of my life from a gorgeous long haired Greek stunner which was so good I didn't even bother with the sex, but most of my mates (and I) have experienced any or all of the following randomly: no touching (I mean no touching anything, just fuck and go), no top off and/or no boob fiddling, being told half way through 'times up pay another 50 euros' (very common, you get 10 mins max to do it usually), psycho freak out women who threaten to call their pimp/police if you don't leave the minute after paying in advance, the dramatic switch after paying from charming to grim and then a cold as ice fuck, etc. In other words its more than likely you wont get any kind of significant pleasurable experience.
So if you must, avoid the really touristy busy RLD canals, especially at weekends, that way you are more likely to get a better punt. Gawp by all means but don't expect anything other than a brief cold shag if you commit. Do not under any circumstances photograph or even look like you are photographing any of the girls in their windows, its the quickest way to get your head pummelled in and thrown in the canal. Try and find one that does by the 1/2 or hour, (they have a sign saying Kamer te huur or similar, that way assuming you chose well you have a much better chance of doing more stuff - but do check, and double check again in three languages if possible). Oh and try and work out why some poor sods frequent the truly grotesque & huge mainly African women that have their own little row of windows by the church/Bulldog coffee shop over the gorgeous women right opposite, because I cant.
Even better read through this, http://forum.auto-censored.com/topic/1139-brothels/
the brothel guide half way down is very well written and accurate even a year after it was written
the best one mentioned is Asmara, by miles. Body to Body massage is standard, it has a great rep and mostly very attractive younger girls (and legal and licensed) Talking of miles, its not walking distance from anywhere really, get a cab. I just checked the web link and it had trouble opening, I hope its still open, I haven't been for a while.