The simplest place to start could be
https://www.xperthealth.org.uk/Shop/p/handbook-lowcarb-highfat-lifestyle
It has an explanation of LCHF and is simple to understand. It also has some simple recipe examples, and meal planning.
Without buying a book you could get some good recipe ideas online. Diet doctor site is very useful
https://www.dietdoctor.com/
I would advise caution when buying cookbooks. I have a few, but the nutritional information is lacking. Better to start off with the links given abov.