What are the best resources to learn about Continuous Integration in Mobile Development?

I know this question covers wide area (actually no idea this is right place to ask this kind of questions), but It would be really helpful for me get advice from experienced experts. At least one could point out few points it would be really helpful.

I'm planning to introduce new and better mobile development process (with proper testing mechanisms) related to mobile development.

My company currently handling iOS, Android and Phonegap/Ionic mobile application development projects.

1. What is the best way to handle mobile project from when we get it from a specific client? (Ex: gather requirement via user stories, wire-framing etc)
2. Testing (any automation tools-both UI and functionality) Continuous Integration/Delivery/Deploy methods can be used?
3. Books, tutorials or any resources that can be worth referring?