As far as I know, this was the main strategy of the Germans: drawing the Allied forces into Belgium while outflanking them at the same time through the Ardennes. Correct?
So, I fail to see what purpose an invasion of the Netherlands has actually. Was it just to take out a potential nuisance, like Norway? Or was there any strategic connection to the rest of Fall Gelb?
The Netherlands were invaded mainly because parts of their country, notably a small strip of land known as the "Masstricht appendix" offered an easy way around the Belgian water defences which were quite formidable in some areas. That wasn't the only reason though. Holland contained valuable air bases which could be used to strike at Britain, and the Dutch army was pitifully weak which made them an easy conquest.
to take out a potential nuisance, like Norway?
The main reason for the invasion of Norway was to secure the iron ore supply that was mined at Kiruna in Sweden and transported along the Malmbanan railway to the Norwegian port of Narvik.
The British were widely believed by German high command to be considering violating Norwegian neutrality by dropping mines in Norwegian territorial waters, or landing an expeditionary force at Narvik with the excuse of sending aid to Finland to fight the Russians.
Eventually the British did start mining Norwegian waters to try and interrupt the iron ore trade, Operation Wilfred, so the invasion of Norway was ordered (and that of Denmark, which really just happened to be in the way).