I have just put together a short article on a first trad climbing rack over on my Snowdonia Mountain Guides website. It covers the basics of what you will need and the quantities for equipment for a beginners lead climbing rack.
As well as this article, I have also started migrating some of the Climbing Coach posts that are more like articles across to a a new section on that website. Hopefully it will be more user friendly as you won’t have to dig deep into the archive history of the blog. They fall under the Coaching Articles in the menu