Hi and welcome to the forum from a
mid wales
as to the question I would advise to go onto the zwartbles society website and the texel society website. They will usually have a page about how to show them, what judges will be looking for etc, etc. It may also be worthwhile to go to shows next year and look at what there is and how people do things, also try and talk to breeders too, nothing like advice from a professional. Also maybe arrange to visit their farms to talk about breeding and pick up some tips from them. Hope this helps and could you let us know how you get on?