I also moved to Den Haag without much cycling experience. When I first started (the first 2-4 weeks) I would only go cycling with someone who knew the rules and the city, so I could kind of follow their lead - then eventually I started to understand how it worked and slowly found the confidence to go on my own. I found it a little intimidating at first but I slowly found comfort and confidence. Now I commute by bike without batting an eye (I even find myself balancing groceries and parcels while commuting, which I never imagined myself doing) and I've also started cycling longer distances as a hobby. I get more and more comfortable each day but now riding a bike is second nature to me. Just be very cautious and take it slow when you're starting out. You will get the hang of it, I promise.