For gore pilgrims one of the best places to start is the original starter set, which is now becoming a stand alone start collecting box. You get a blood secrator, 20 blood reavers, 5 blood warriors and but then you get a couple of extra units that you'll probably not use
I haven't tried it with the Ordinator but in a few games I've dropped my ballistas on objectives or areas that forced my opponents to have to make a choice of targets. Also having those units set up in reserves seems to have unnerved a couple of guys I faced. It made them make mistakes that I was able to capitalize on.