Hypercasual Runner Starter Kit User Manual
Simple and extensible package that allows any developer to create beautiful runner games whether he/she is an experienced or beginner.
You can find the package at Unity Asset Store
I highly recommend you to look over the demo scenes for learning purposes. Those example games created for you to give a sense of what is possible.
I also highly recommend that you come to our Discord Server for learning from others, chatting with developers or asking questions!