[HELP]Could anyone please make some Courses how to build CM for us-oneplus2

I Just want to build a CM for us. and i was trapped~~
I know
1.find a linux and install dependences and JDK7
2.repo from CM
3.clone souces code (devices | vendor | kernel)
and when a get these i don't know what to do next............
Could anyone told me, or please make some Courses~~