Yes, Windsor & Newton is a brand that you can use. They also do acrylics and water color (gouache) in tubes that's really hady for drybrushing, washes,...
To do dry brushing, you dip your brush (it's got to be a softie, and a flat squared one at that, into the paint then remove the excess paint into a rag or something. When the brush is nearly dry and paint-free, it is time to brush all over your model, concentrating on edges. The little paint you have will deposit itself on those raised details and edges and will make your model look more '3-D'.
The paint you should use are lighter colours of what is on your model as base colour or camouflage. For instance, on a German AFV from the early war, painted panzer-grey, use first a lighter shade of Grey, then a lighter, then a lighter, then pure white, each time being more and more 'gentle' and subtle.
To accentuate the recesses and holes, you use a wash instead, which is made with a darker paint than your base colour. I usually do the wash first, followed by dry-brushing then weathering. Let us know when your website is up and running.