For a moment there I was happy when you said you'll 'develop your 100 domains'. But the 'copy/pasting' part took away my charm.
My friend, if you have decided to develop your domains, then my advice would be to do it the right way:
1. Do not develop 100 domains at once. Instead, develop a single or two at a time. That is, if you want to develop domains in to a working website AND not just dummy/filler websites.
2. Do not settle for PLR products/content. Instead, use unique content. For templates, you can use Wordpress themes.
3. And as long as you are on to it, don't forget to go social. to spread the word out, it really helps in the long run.
Not sure what your intentions are behind developing 100 domains, but be unique and plan things as you go.
I know developing 100 domains uniquely isn't something that easy and economical for all, that is why a good route would be to develop a single or two sites at a time and concentrating on its marketing and promotion.
Hope it makes sense.